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It is the complete and only authoritative description of what is required: the scientific question, the inputs under `data/`, the required output files and their exact keys, and the information-availability rules.\n- There is no network access. Use the Python interpreter `~/wp29/venv/bin/python` (numpy, pandas, scipy, statsmodels, matplotlib are installed). Standard shell tools are available. Do not try to install packages.\n- Write every deliverable under `./out/`. The required deliverables are listed in `TASK.md`; at minimum they always include `out/results.json`, `out/report.md`, and a replication entry point `out/analysis.py` that regenerates `out/results.json` from `data/` when run with `~/wp29/venv/bin/python out/analysis.py` from the workspace root.\n- You are working alone and unattended; nobody will answer questions. Make reasonable, documented decisions.\n\nIntegrity rules (identical for every task):\n- Never fabricate numbers, data, results, or references. Every number in `out/results.json` and `out/report.md` must be produced by code you ran on the provided inputs.\n- Respect the information-availability rules in `TASK.md` exactly (for example, never use information that would not have been available at the stated decision time).\n- If part of the task cannot be completed as specified, say so explicitly in `out/report.md`, explain why, and still write every required file (use `null` for values you could not legitimately produce). An honest statement of a limitation is always preferred to a fabricated or guessed value.\n- Do not modify anything under `data/`.\n- When you are done, end with a brief plain-text summary of what you produced and any limitations.\n\nComplete the task described in `TASK.md` by following this research protocol. The protocol adds no scientific information to the task; it organizes how you work and what evidence you leave behind.\n\nPHASES (execute in order; a phase is eligible only when its dependencies are satisfied):\n\nP0 Scope and contract (depends on: nothing)\n- Read `TASK.md` completely. In `out/state/contract.md`, restate in your own words: the scientific question; the quantity or quantities to be estimated (the estimands) and the assumptions under which they are meaningful; every required output file and key; the information-availability rules; what would make the task impossible or the result invalid.\n- Write the initial phase ledger `out/state/phases.json`: a JSON object mapping each phase id (P0 … P5) to {\"status\": \"pending\"|\"running\"|\"passed\"|\"failed\"|\"blocked\"|\"stale\"|\"skipped_optional\", \"checks\": [], \"notes\": \"\"}. Keep it current as you work. A phase may only be set to \"passed\" when the checks listed for it in this protocol have actually been executed and their outcome recorded in \"checks\".\n\nP1 Data audit and provenance (depends on: P0)\n- Inspect every input file: compute and record its SHA-256, row and column counts, schema, units, date ranges, missing values, duplicates and anomalies in `out/state/data_audit.md`.\n- Keep an exclusion ledger in `out/exclusions.csv` (columns: step, rule, n_before, n_after, n_removed, rationale) for every filtering step you apply, so that n_raw − total removed = n_analysed.\n- Identify any input that violates the information-availability rules and decide, in writing, how you will handle it.\n\nP2 Baseline (depends on: P1)\n- Before any elaborate method, compute the simplest valid baseline that answers the question (for example a naïve or unconditional estimate), with the same evaluation rule used later. Record it in `out/results.json` under the keys the task requires, or under `baseline_*` keys when the task does not name them.\n\nP3 Method and computation (depends on: P2)\n- Implement the analysis in `out/analysis.py` so that it reads only `data/`, writes `out/results.json` deterministically (fix every random seed you use and record it), and prints nothing that contradicts the written results. Any figure or table must be generated by this script.\n\nP4 Verification (depends on: P3)\n- Re-run `out/analysis.py` from a clean state and confirm it regenerates `out/results.json` with identical values. Record the check in `out/state/phases.json` under P4.\n- Check internal consistency: identities that must hold (for example counts that must add up, standard errors that must be positive, confidence intervals that must contain their estimates, date orderings that must respect the information rules), units, and magnitudes against the baseline. Record every check and its outcome in `out/state/checks.md`. A failed check must be fixed or honestly reported, never silently ignored.\n\nP5 Reporting (depends on: P4)\n- Write `out/report.md` with the sections: Question; Data and exclusions; Method; Results; Uncertainty; Limitations and open issues. Every quantitative statement must cite the key of `out/results.json` it comes from.\n- Write `out/claims.json`: a list of the central claims of your report, each as {\"id\": \"C1\", \"text\": \"...\", \"results_keys\": [\"...\"], \"status\": \"supported\"|\"unsupported\"|\"not_evaluated\", \"caveat\": \"...\"}. Do not state a claim in the report that is not in this ledger.\n- Set the final statuses in `out/state/phases.json`.\n\nSTOPPING RULES\n- Stop and declare the task complete only when every phase P0–P5 is \"passed\" with recorded checks. If a phase is \"blocked\" (missing information, impossible requirement, violated availability rule), stop, set the status, explain in `out/report.md` (section Limitations and open issues) and still write every required file with `null` for values you could not legitimately produce.\n- Do not spend effort on extensions that the task does not require.\n\nRECOVERY RULES\n- Append a short dated entry to `out/state/log.md` after each phase transition and after any important decision, so that work can be resumed by reading `out/state/`.\n- If you discover that an upstream input or decision changed after a downstream phase passed, mark the downstream phases \"stale\" and redo them; do not reuse stale results.\n- If you are interrupted and later resumed, first read `out/state/` and continue from the last consistent state; never re-run expensive steps that already have recorded, unchanged outputs.\n\nEXECUTABLE GATES (additional, mandatory)\n- A read-only gate program is provided at `~/wp29/gates/pgar_gate.py`. Run it from the workspace root as `~/wp29/venv/bin/python ~/wp29/gates/pgar_gate.py .` It checks the output contract of `TASK.md` (required files, keys, types, finite values, report sections, the claims ledger, the phase ledger, the exclusion ledger) and reproducibility (it re-runs `out/analysis.py` in a temporary copy and compares the regenerated `out/results.json` with yours). It never checks scientific correctness and it contains no reference answers.\n- You must run the gate at the end of P4 and again at the end of P5, and record each run's receipt (the gate writes `out/state/gate_receipts/<timestamp>.json`) in `out/state/phases.json`. You may not declare the task complete while the latest gate receipt reports `\"passed\": false`. Fix the reported problems and re-run the gate.\n- The controller will run the same gate after your session ends. If it fails, you will be resumed with the gate output and asked to fix the problems; each such cycle consumes your remaining budget.\n\nSEPARATE REVIEW (additional)\n- After the gate passes, a separate reviewer session that has not seen your work in progress will examine `TASK.md` and everything under `out/` and may return a list of issues (file `out/review/review.json`). You will then be resumed once to address them: fix what is justified, explain in `out/report.md` (Limitations and open issues) what you disagree with, re-run the gate, and update `out/claims.json` and `out/state/phases.json`. The reviewer has no reference answers; its role is to challenge unsupported claims, violated information rules, unverified computations, and inconsistencies between your report and your results.\n"}],"tools":[{"name":"Bash","description":"execute shell commands","input_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","type":"object","properties":{"command":{"description":"The command to execute","type":"string"},"timeout":{"description":"Optional timeout in milliseconds (max 600000 for a foreground command)","type":"number"},"description":{"description":"Clear, concise description of what this command does in active voice. 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The Bellman equation is V(y) = max_{0<c<y} { ln c + β V((y − c)^α) }. This model has a known closed-form solution for the optimal consumption policy c(y) and the value function V(y). The estimands are: the closed-form policy at three evaluation points of y; the policy obtained by value-function iteration (VFI) on the prescribed grid at the same points; the maximum absolute discrepancy between them over the evaluation points; the closed-form and numerical value function at y = 1; the savings rate implied by the closed form; and the contraction modulus of the Bellman operator in the sup norm.\n\n## Inputs\n- `data/model.csv` — columns `parameter`, `value`, `description`: `alpha`, `beta`, the grid specification (`y_min`, `y_max`, `grid_points`, `grid_spacing` = log, i.e. points equally spaced in ln y), the VFI stopping tolerance `vfi_tolerance` (sup-norm change between successive value functions), and the three evaluation points `eval_y_1`, `eval_y_2`, `eval_y_3`. Theoretical parameters, not observed data.\n\n## Information-availability rules\n- Use only `data/model.csv` and solve the model on the prescribed grid with the prescribed parameters; if any deviation from the prescribed design is necessary, record it in `data_issues`.\n- The numerical policy must come from the VFI, not from the closed form; the closed form must be derived (e.g. guess-and-verify on the Bellman equation) and stated in the report.\n\n## Required outputs\n- `out/results.json` with the keys:\n\n| key | type | unit | meaning |\n|---|---|---|---|\n| `task_id` | string | — | \"F5-conf-04\" |\n| `c_closed_y05`, `c_closed_y1`, `c_closed_y2` | number | units of output | closed-form optimal consumption at y = 0.5, 1.0, 2.0 |\n| `c_num_y05`, `c_num_y1`, `c_num_y2` | number | units of output | VFI consumption policy at y = 0.5, 1.0, 2.0 (interpolated on the grid if the point is not a grid node) |\n| `max_abs_error_policy` | number | units of output | max over the three evaluation points of \\|c_num − c_closed\\| |\n| `value_closed_y1` | number | utils | closed-form V(1) |\n| `value_num_y1` | number | utils | VFI value function at y = 1 |\n| `savings_rate_closed_form` | number | — | closed-form (y − c)/y (the baseline quantity) |\n| `contraction_modulus` | number | — | modulus of the Bellman operator as a contraction in the sup norm |\n| `grid_points_used` | integer | — | number of grid points actually used |\n| `n_iterations` | integer | — | VFI iterations until the stopping rule was met |\n| `final_sup_change` | number | utils | sup-norm change at the last iteration |\n| `feasibility` | string | — | \"complete\", \"partial\" or \"infeasible\" |\n| `feasibility_reason` | string or null | — | explanation if not complete |\n| `data_issues` | array of {\"issue\",\"handling\"} | — | data problems or design deviations and how handled (empty list if none) |\n| `n_input_rows` | object | — | {\"model.csv\": rows read} |\n| `n_analysed` | integer or null | — | number of grid points |\n| `random_seed` | integer or null | — | seed used, if any |\n\n- `out/report.md` with the sections: Question; Data and exclusions; Method; Results; Uncertainty; Limitations and open issues. State explicitly the assumptions of the closed form (log utility, Cobb–Douglas technology, full depreciation, interior solution), why the Bellman operator is a contraction and with what modulus, and the scope of the numerical validation (which grid, which parameter point, what the discretisation error depends on).\n- `out/analysis.py` — running `~/wp29/venv/bin/python out/analysis.py` from the workspace root must regenerate `out/results.json` from `data/` only, deterministically.\n- `out/claims.json` — a list of the central claims of the report: [{\"id\": \"C1\", \"text\": \"...\", \"results_keys\": [\"...\"], \"status\": \"supported\"|\"unsupported\"|\"not_evaluated\", \"caveat\": \"...\"}]. Each claim's status must be justified by the listed results keys.\n\n## Constraints\n- No network access. Python: `~/wp29/venv/bin/python` (numpy, pandas, scipy, statsmodels available). Do not modify `data/`.\n- This task is designed to be completed in well under 20 minutes of work; the VFI on the prescribed grid runs in seconds when vectorised.\nbundle.json\ndata\ngate_spec.json\nTASK.md\n\n./data:\nmodel.csv","is_error":true,"tool_use_id":"toolu_017Lk355tx5nKksyyuAtsEzA"}]},"uuid":"007f7d1b-e42c-49b3-aa46-e527f72a2c13","timestamp":"2026-10-30T04:37:40.952Z","toolUseResult":"Error: Exit code 1\n# F5-conf-04 — Value-function iteration against a closed-form policy (optimal growth with log utility)\n\n## Scientific question\nA planner maximises Σ_t β^t ln c_t subject to y_{t+1} = (y_t − c_t)^α, 0 < c_t < y_t, with full depreciation and productivity normalised to one. The Bellman equation is V(y) = max_{0<c<y} { ln c + β V((y − c)^α) }. This model has a known closed-form solution for the optimal consumption policy c(y) and the value function V(y). The estimands are: the closed-form policy at three evaluation points of y; the policy obtained by value-function iteration (VFI) on the prescribed grid at the same points; the maximum absolute discrepancy between them over the evaluation points; the closed-form and numerical value function at y = 1; the savings rate implied by the closed form; and the contraction modulus of the Bellman operator in the sup norm.\n\n## Inputs\n- `data/model.csv` — columns `parameter`, `value`, `description`: `alpha`, `beta`, the grid specification (`y_min`, `y_max`, `grid_points`, `grid_spacing` = log, i.e. points equally spaced in ln y), the VFI stopping tolerance `vfi_tolerance` (sup-norm change between successive value functions), and the three evaluation points `eval_y_1`, `eval_y_2`, `eval_y_3`. Theoretical parameters, not observed data.\n\n## Information-availability rules\n- Use only `data/model.csv` and solve the model on the prescribed grid with the prescribed parameters; if any deviation from the prescribed design is necessary, record it in `data_issues`.\n- The numerical policy must come from the VFI, not from the closed form; the closed form must be derived (e.g. guess-and-verify on the Bellman equation) and stated in the report.\n\n## Required outputs\n- `out/results.json` with the keys:\n\n| key | type | unit | meaning |\n|---|---|---|---|\n| `task_id` | string | — | \"F5-conf-04\" |\n| `c_closed_y05`, `c_closed_y1`, `c_closed_y2` | number | units of output | closed-form optimal consumption at y = 0.5, 1.0, 2.0 |\n| `c_num_y05`, `c_num_y1`, `c_num_y2` | number | units of output | VFI consumption policy at y = 0.5, 1.0, 2.0 (interpolated on the grid if the point is not a grid node) |\n| `max_abs_error_policy` | number | units of output | max over the three evaluation points of \\|c_num − c_closed\\| |\n| `value_closed_y1` | number | utils | closed-form V(1) |\n| `value_num_y1` | number | utils | VFI value function at y = 1 |\n| `savings_rate_closed_form` | number | — | closed-form (y − c)/y (the baseline quantity) |\n| `contraction_modulus` | number | — | modulus of the Bellman operator as a contraction in the sup norm |\n| `grid_points_used` | integer | — | number of grid points actually used |\n| `n_iterations` | integer | — | VFI iterations until the stopping rule was met |\n| `final_sup_change` | number | utils | sup-norm change at the last iteration |\n| `feasibility` | string | — | \"complete\", \"partial\" or \"infeasible\" |\n| `feasibility_reason` | string or null | — | explanation if not complete |\n| `data_issues` | array of {\"issue\",\"handling\"} | — | data problems or design deviations and how handled (empty list if none) |\n| `n_input_rows` | object | — | {\"model.csv\": rows read} |\n| `n_analysed` | integer or null | — | number of grid points |\n| `random_seed` | integer or null | — | seed used, if any |\n\n- `out/report.md` with the sections: Question; Data and exclusions; Method; Results; Uncertainty; Limitations and open issues. State explicitly the assumptions of the closed form (log utility, Cobb–Douglas technology, full depreciation, interior solution), why the Bellman operator is a contraction and with what modulus, and the scope of the numerical validation (which grid, which parameter point, what the discretisation error depends on).\n- `out/analysis.py` — running `~/wp29/venv/bin/python out/analysis.py` from the workspace root must regenerate `out/results.json` from `data/` only, deterministically.\n- `out/claims.json` — a list of the central claims of the report: [{\"id\": \"C1\", \"text\": \"...\", \"results_keys\": [\"...\"], \"status\": \"supported\"|\"unsupported\"|\"not_evaluated\", \"caveat\": \"...\"}]. Each claim's status must be justified by the listed results keys.\n\n## Constraints\n- No network access. Python: `~/wp29/venv/bin/python` (numpy, pandas, scipy, statsmodels available). Do not modify `data/`.\n- This task is designed to be completed in well under 20 minutes of work; the VFI on the prescribed grid runs in seconds when 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Compare the closed-form policy/value with VFI on the prescribed log-spaced grid.\n**Estimands.** Closed-form c(y) at y=0.5,1,2; VFI c(y) at same points (interpolated if off-grid); max |c_num-c_closed|; closed-form and VFI V(1); closed-form savings rate (y-c)/y; Bellman contraction modulus (sup norm). 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-p out/state && cd out/state && cat > contract.md <<'EOF'\n# Contract (P0)\n**Question.** Deterministic optimal growth, log utility, y' = (y-c)^alpha, full depreciation, A=1. Compare the closed-form policy/value with VFI on the prescribed log-spaced grid.\n**Estimands.** Closed-form c(y) at y=0.5,1,2; VFI c(y) at same points (interpolated if off-grid); max |c_num-c_closed|; closed-form and VFI V(1); closed-form savings rate (y-c)/y; Bellman contraction modulus (sup norm). Meaningful under: log utility, Cobb-Douglas, full depreciation, interior solution, 0<beta<1, 0<alpha<1.\n**Outputs.** out/results.json (keys per TASK.md table: task_id, c_closed_y05/y1/y2, c_num_y05/y1/y2, max_abs_error_policy, value_closed_y1, value_num_y1, savings_rate_closed_form, contraction_modulus, grid_points_used, n_iterations, final_sup_change, feasibility, feasibility_reason, data_issues, n_input_rows, n_analysed, random_seed); out/report.md (6 sections); out/analysis.py; out/claims.json; plus protocol files.\n**Information rules.** Only data/model.csv; prescribed grid/params; deviations go to data_issues; numerical policy from VFI only, closed form derived in report.\n**Invalidity.** Grid not containing feasible/optimal choices (truncation), VFI not converging, use of closed form inside VFI.\nEOF\ncat > phases.json <<'EOF'\n{\"P0\":{\"status\":\"passed\",\"checks\":[\"TASK.md read fully\",\"contract.md written\"],\"notes\":\"\"},\n\"P1\":{\"status\":\"pending\",\"checks\":[],\"notes\":\"\"},\"P2\":{\"status\":\"pending\",\"checks\":[],\"notes\":\"\"},\n\"P3\":{\"status\":\"pending\",\"checks\":[],\"notes\":\"\"},\"P4\":{\"status\":\"pending\",\"checks\":[],\"notes\":\"\"},\n\"P5\":{\"status\":\"pending\",\"checks\":[],\"notes\":\"\"}}\nEOF\necho \"- 2026-10-30 P0 passed: contract written.\" > log.md","description":"Write contract, phase ledger, 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> out/analysis.py <<'EOF'\n\"\"\"F5-conf-04: VFI vs closed form, optimal growth with log utility.\nRun from workspace root: ~/wp29/venv/bin/python out/analysis.py\nReads only data/model.csv; deterministic (no randomness).\"\"\"\nimport json, os, csv\nimport numpy as np\n\nROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))\nDATA = os.path.join(ROOT, \"data\", \"model.csv\")\nOUT = os.path.join(ROOT, \"out\")\n\nwith open(DATA, newline=\"\") as f:\n rows = list(csv.DictReader(f))\np = {r[\"parameter\"]: r[\"value\"] for r in rows}\nalpha = float(p[\"alpha\"]); beta = float(p[\"beta\"])\ny_min = float(p[\"y_min\"]); y_max = float(p[\"y_max\"]); N = int(float(p[\"grid_points\"]))\nassert p[\"grid_spacing\"].strip() == \"log\"\ntol = float(p[\"vfi_tolerance\"])\neval_y = [float(p[\"eval_y_1\"]), float(p[\"eval_y_2\"]), float(p[\"eval_y_3\"])]\n\n# ---------------- closed form (guess-and-verify V = A + B ln y) ----------------\nab = alpha * beta\nB = 1.0 / (1.0 - ab)\nA = (np.log(1.0 - ab) + ab / (1.0 - ab) * np.log(ab)) / (1.0 - beta)\nc_closed = lambda y: (1.0 - ab) * np.asarray(y)\nV_closed = lambda y: A + B * np.log(y)\nsavings_rate = ab\n\n# ---------------- VFI on prescribed grid (discrete choice of y' on grid) --------\ngrid = np.exp(np.linspace(np.log(y_min), np.log(y_max), N))\nk_needed = grid ** (1.0 / alpha) # capital needed to reach y' = grid[j]\nC = grid[:, None] - k_needed[None, :] # c(i, j) = y_i - y'_j^(1/alpha)\nfeasible = C > 0\nU = np.full_like(C, -np.inf)\nU[feasible] = np.log(C[feasible])\nassert feasible.any(axis=1).all(), \"some grid point has no feasible choice\"\n\nV = np.zeros(N)\nn_iter = 0\nsup_change = np.inf\nmax_iter = 100000\nwhile sup_change >= tol and n_iter < max_iter:\n W = U + beta * V[None, :]\n V_new = W.max(axis=1)\n sup_change = float(np.max(np.abs(V_new - V)))\n V = V_new\n n_iter += 1\nconverged = sup_change < tol\npol_j = (U + beta * V[None, :]).argmax(axis=1)\nc_pol = grid - k_needed[pol_j]\n\n# boundary diagnostics: does the optimal choice ever hit grid edges?\nhits_lower = int(np.sum(pol_j == 0)); hits_upper = int(np.sum(pol_j == N - 1))\n\n# interpolation at evaluation points: linear in ln y (grid is uniform in ln y)\nlg = np.log(grid)\ninterp = lambda f, y: float(np.interp(np.log(y), lg, f))\nc_num = [interp(c_pol, y) for y in eval_y]\nc_cl = [float(c_closed(y)) for y in eval_y]\non_grid = [bool(np.any(np.isclose(grid, y, rtol=1e-12, atol=0))) for y in eval_y]\nmax_err = float(max(abs(a - b) for a, b in zip(c_num, c_cl)))\n\n# whole-grid diagnostics (for report only)\ngrid_policy_err = float(np.max(np.abs(c_pol - c_closed(grid))))\ngrid_value_err = float(np.max(np.abs(V - V_closed(grid))))\n\ndata_issues = []\nif not all(on_grid):\n data_issues.append({\"issue\": \"Evaluation points %s are not grid nodes of the log-spaced grid\" %\n [y for y, o in zip(eval_y, on_grid) if not o],\n \"handling\": \"VFI policy and value interpolated linearly in ln(y) between adjacent grid nodes\"})\ndata_issues.append({\"issue\": \"Design choice: the choice variable is next-period output y' restricted to the same grid (discrete-choice VFI); consumption c = y - y'^(1/alpha)\",\n \"handling\": \"No deviation from prescribed grid/parameters; discretisation error of order of the grid spacing is reported, not corrected\"})\n\nfeas = \"complete\" if converged else \"partial\"\nres = {\n \"task_id\": \"F5-conf-04\",\n \"c_closed_y05\": c_cl[0], \"c_closed_y1\": c_cl[1], \"c_closed_y2\": c_cl[2],\n \"c_num_y05\": c_num[0], \"c_num_y1\": c_num[1], \"c_num_y2\": c_num[2],\n \"max_abs_error_policy\": max_err,\n \"value_closed_y1\": float(V_closed(1.0)),\n \"value_num_y1\": interp(V, 1.0),\n \"savings_rate_closed_form\": float(savings_rate),\n \"contraction_modulus\": float(beta),\n \"grid_points_used\": int(N),\n \"n_iterations\": int(n_iter),\n \"final_sup_change\": float(sup_change),\n \"feasibility\": feas,\n \"feasibility_reason\": None if converged else \"VFI did not reach tolerance within max_iter\",\n \"data_issues\": data_issues,\n \"n_input_rows\": {\"model.csv\": len(rows)},\n \"n_analysed\": int(N),\n \"random_seed\": None,\n # supplementary diagnostics\n \"diag_grid_log_step\": float(lg[1] - lg[0]),\n \"diag_max_abs_policy_error_on_grid\": grid_policy_err,\n \"diag_max_abs_value_error_on_grid\": grid_value_err,\n \"diag_policy_hits_lower_bound\": hits_lower,\n \"diag_policy_hits_upper_bound\": hits_upper,\n \"diag_value_error_y1\": interp(V, 1.0) - float(V_closed(1.0)),\n \"diag_closed_form_A\": float(A), \"diag_closed_form_B\": float(B),\n \"diag_vfi_error_bound_beta_over_1mbeta_times_final_change\": float(beta / (1 - beta) * sup_change),\n}\nos.makedirs(OUT, exist_ok=True)\nwith open(os.path.join(OUT, \"results.json\"), \"w\") as f:\n json.dump(res, f, indent=2)\nwith open(os.path.join(OUT, \"exclusions.csv\"), \"w\") as f:\n f.write(\"step,rule,n_before,n_after,n_removed,rationale\\n\")\n f.write(\"1,none (all parameter rows used),%d,%d,0,model.csv contains only parameters; nothing excluded\\n\" % (len(rows), len(rows)))\nprint(json.dumps({k: v for k, v in res.items() if k != \"data_issues\"}, indent=1))\nEOF\n~/wp29/venv/bin/python out/analysis.py","description":"Write and run analysis 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code 2\n(eval):1: no such file or directory: out/analysis.py\n/opt/homebrew/Cellar/python@3.14/3.14.4/Frameworks/Python.framework/Versions/3.14/Resources/Python.app/Contents/MacOS/Python: can't open file '/Users/simon-pierreboucher/wp29/runs/RC0127/out/state/out/analysis.py': [Errno 2] No such file or directory","is_error":true,"tool_use_id":"toolu_01RLAR55CGgvu4PN8iLNGgYW"}]},"uuid":"1a65a2da-417c-4c02-a65c-27336c447526","timestamp":"2026-10-30T04:38:24.917Z","toolUseResult":"Error: Exit code 2\n(eval):1: no such file or directory: out/analysis.py\n/opt/homebrew/Cellar/python@3.14/3.14.4/Frameworks/Python.framework/Versions/3.14/Resources/Python.app/Contents/MacOS/Python: can't open file '/Users/simon-pierreboucher/wp29/runs/RC0127/out/state/out/analysis.py': [Errno 2] No such file or 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np\n\nROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))\nDATA = os.path.join(ROOT, \"data\", \"model.csv\")\nOUT = os.path.join(ROOT, \"out\")\n\nwith open(DATA, newline=\"\") as f:\n rows = list(csv.DictReader(f))\np = {r[\"parameter\"]: r[\"value\"] for r in rows}\nalpha = float(p[\"alpha\"]); beta = float(p[\"beta\"])\ny_min = float(p[\"y_min\"]); y_max = float(p[\"y_max\"]); N = int(float(p[\"grid_points\"]))\nassert p[\"grid_spacing\"].strip() == \"log\"\ntol = float(p[\"vfi_tolerance\"])\neval_y = [float(p[\"eval_y_1\"]), float(p[\"eval_y_2\"]), float(p[\"eval_y_3\"])]\n\n# ---------------- closed form (guess-and-verify V = A + B ln y) ----------------\nab = alpha * beta\nB = 1.0 / (1.0 - ab)\nA = (np.log(1.0 - ab) + ab / (1.0 - ab) * np.log(ab)) / (1.0 - beta)\nc_closed = lambda y: (1.0 - ab) * np.asarray(y)\nV_closed = lambda y: A + B * np.log(y)\nsavings_rate = ab\n\n# ---------------- VFI on prescribed grid (discrete choice of y' on grid) --------\ngrid = np.exp(np.linspace(np.log(y_min), np.log(y_max), N))\nk_needed = grid ** (1.0 / alpha) # capital needed to reach y' = grid[j]\nC = grid[:, None] - k_needed[None, :] # c(i, j) = y_i - y'_j^(1/alpha)\nfeasible = C > 0\nU = np.full_like(C, -np.inf)\nU[feasible] = np.log(C[feasible])\nassert feasible.any(axis=1).all(), \"some grid point has no feasible choice\"\n\nV = np.zeros(N)\nn_iter = 0\nsup_change = np.inf\nmax_iter = 100000\nwhile sup_change >= tol and n_iter < max_iter:\n W = U + beta * V[None, :]\n V_new = W.max(axis=1)\n sup_change = float(np.max(np.abs(V_new - V)))\n V = V_new\n n_iter += 1\nconverged = sup_change < tol\npol_j = (U + beta * V[None, :]).argmax(axis=1)\nc_pol = grid - k_needed[pol_j]\n\n# boundary diagnostics: does the optimal choice ever hit grid edges?\nhits_lower = int(np.sum(pol_j == 0)); hits_upper = int(np.sum(pol_j == N - 1))\n\n# interpolation at evaluation points: linear in ln y (grid is uniform in ln y)\nlg = np.log(grid)\ninterp = lambda f, y: float(np.interp(np.log(y), lg, f))\nc_num = [interp(c_pol, y) for y in eval_y]\nc_cl = [float(c_closed(y)) for y in eval_y]\non_grid = [bool(np.any(np.isclose(grid, y, rtol=1e-12, atol=0))) for y in eval_y]\nmax_err = float(max(abs(a - b) for a, b in zip(c_num, c_cl)))\n\n# whole-grid diagnostics (for report only)\ngrid_policy_err = float(np.max(np.abs(c_pol - c_closed(grid))))\ngrid_value_err = float(np.max(np.abs(V - V_closed(grid))))\n\ndata_issues = []\nif not all(on_grid):\n data_issues.append({\"issue\": \"Evaluation points %s are not grid nodes of the log-spaced grid\" %\n [y for y, o in zip(eval_y, on_grid) if not o],\n \"handling\": \"VFI policy and value interpolated linearly in ln(y) between adjacent grid nodes\"})\ndata_issues.append({\"issue\": \"Design choice: the choice variable is next-period output y' restricted to the same grid (discrete-choice VFI); consumption c = y - y'^(1/alpha)\",\n \"handling\": \"No deviation from prescribed grid/parameters; discretisation error of order of the grid spacing is reported, not corrected\"})\n\nfeas = \"complete\" if converged else \"partial\"\nres = {\n \"task_id\": \"F5-conf-04\",\n \"c_closed_y05\": c_cl[0], \"c_closed_y1\": c_cl[1], \"c_closed_y2\": c_cl[2],\n \"c_num_y05\": c_num[0], \"c_num_y1\": c_num[1], \"c_num_y2\": c_num[2],\n \"max_abs_error_policy\": max_err,\n \"value_closed_y1\": float(V_closed(1.0)),\n \"value_num_y1\": interp(V, 1.0),\n \"savings_rate_closed_form\": float(savings_rate),\n \"contraction_modulus\": float(beta),\n \"grid_points_used\": int(N),\n \"n_iterations\": int(n_iter),\n \"final_sup_change\": float(sup_change),\n \"feasibility\": feas,\n \"feasibility_reason\": None if converged else \"VFI did not reach tolerance within max_iter\",\n \"data_issues\": data_issues,\n \"n_input_rows\": {\"model.csv\": len(rows)},\n \"n_analysed\": int(N),\n \"random_seed\": None,\n # supplementary diagnostics\n \"diag_grid_log_step\": float(lg[1] - lg[0]),\n 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> out/analysis.py <<'EOF'\n\"\"\"F5-conf-04: VFI vs closed form, optimal growth with log utility.\nRun from workspace root: ~/wp29/venv/bin/python out/analysis.py\nReads only data/model.csv; deterministic (no randomness).\"\"\"\nimport json, os, csv\nimport numpy as np\n\nROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))\nDATA = os.path.join(ROOT, \"data\", \"model.csv\")\nOUT = os.path.join(ROOT, \"out\")\n\nwith open(DATA, newline=\"\") as f:\n rows = list(csv.DictReader(f))\np = {r[\"parameter\"]: r[\"value\"] for r in rows}\nalpha = float(p[\"alpha\"]); beta = float(p[\"beta\"])\ny_min = float(p[\"y_min\"]); y_max = float(p[\"y_max\"]); N = int(float(p[\"grid_points\"]))\nassert p[\"grid_spacing\"].strip() == \"log\"\ntol = float(p[\"vfi_tolerance\"])\neval_y = [float(p[\"eval_y_1\"]), float(p[\"eval_y_2\"]), float(p[\"eval_y_3\"])]\n\n# ---------------- closed form (guess-and-verify V = A + B ln y) ----------------\nab = alpha * beta\nB = 1.0 / (1.0 - ab)\nA = (np.log(1.0 - ab) + ab / (1.0 - ab) * np.log(ab)) / (1.0 - beta)\nc_closed = lambda y: (1.0 - ab) * np.asarray(y)\nV_closed = lambda y: A + B * np.log(y)\nsavings_rate = ab\n\n# ---------------- VFI on prescribed grid (discrete choice of y' on grid) --------\ngrid = np.exp(np.linspace(np.log(y_min), np.log(y_max), N))\nk_needed = grid ** (1.0 / alpha) # capital needed to reach y' = grid[j]\nC = grid[:, None] - k_needed[None, :] # c(i, j) = y_i - y'_j^(1/alpha)\nfeasible = C > 0\nU = np.full_like(C, -np.inf)\nU[feasible] = np.log(C[feasible])\nassert feasible.any(axis=1).all(), \"some grid point has no feasible choice\"\n\nV = np.zeros(N)\nn_iter = 0\nsup_change = np.inf\nmax_iter = 100000\nwhile sup_change >= tol and n_iter < max_iter:\n W = U + beta * V[None, :]\n V_new = W.max(axis=1)\n sup_change = float(np.max(np.abs(V_new - V)))\n V = V_new\n n_iter += 1\nconverged = sup_change < tol\npol_j = (U + beta * V[None, :]).argmax(axis=1)\nc_pol = grid - k_needed[pol_j]\n\n# boundary diagnostics: does the optimal choice ever hit grid edges?\nhits_lower = int(np.sum(pol_j == 0)); hits_upper = int(np.sum(pol_j == N - 1))\n\n# interpolation at evaluation points: linear in ln y (grid is uniform in ln y)\nlg = np.log(grid)\ninterp = lambda f, y: float(np.interp(np.log(y), lg, f))\nc_num = [interp(c_pol, y) for y in eval_y]\nc_cl = [float(c_closed(y)) for y in eval_y]\non_grid = [bool(np.any(np.isclose(grid, y, rtol=1e-12, atol=0))) for y in eval_y]\nmax_err = float(max(abs(a - b) for a, b in zip(c_num, c_cl)))\n\n# whole-grid diagnostics (for report only)\ngrid_policy_err = float(np.max(np.abs(c_pol - c_closed(grid))))\ngrid_value_err = float(np.max(np.abs(V - V_closed(grid))))\n\ndata_issues = []\nif not all(on_grid):\n data_issues.append({\"issue\": \"Evaluation points %s are not grid nodes of the log-spaced grid\" %\n [y for y, o in zip(eval_y, on_grid) if not o],\n \"handling\": \"VFI policy and value interpolated linearly in ln(y) between adjacent grid nodes\"})\ndata_issues.append({\"issue\": \"Design choice: the choice variable is next-period output y' restricted to the same grid (discrete-choice VFI); consumption c = y - y'^(1/alpha)\",\n \"handling\": \"No deviation from prescribed grid/parameters; discretisation error of order of the grid spacing is reported, not corrected\"})\n\nfeas = \"complete\" if converged else \"partial\"\nres = {\n \"task_id\": \"F5-conf-04\",\n \"c_closed_y05\": c_cl[0], \"c_closed_y1\": c_cl[1], \"c_closed_y2\": c_cl[2],\n \"c_num_y05\": c_num[0], \"c_num_y1\": c_num[1], \"c_num_y2\": c_num[2],\n \"max_abs_error_policy\": max_err,\n \"value_closed_y1\": float(V_closed(1.0)),\n \"value_num_y1\": interp(V, 1.0),\n \"savings_rate_closed_form\": float(savings_rate),\n \"contraction_modulus\": float(beta),\n \"grid_points_used\": int(N),\n \"n_iterations\": int(n_iter),\n \"final_sup_change\": float(sup_change),\n \"feasibility\": feas,\n \"feasibility_reason\": None if converged else \"VFI did not reach tolerance within max_iter\",\n \"data_issues\": data_issues,\n \"n_input_rows\": {\"model.csv\": len(rows)},\n \"n_analysed\": int(N),\n \"random_seed\": None,\n # supplementary diagnostics\n \"diag_grid_log_step\": float(lg[1] - lg[0]),\n \"diag_max_abs_policy_error_on_grid\": grid_policy_err,\n \"diag_max_abs_value_error_on_grid\": grid_value_err,\n \"diag_policy_hits_lower_bound\": hits_lower,\n \"diag_policy_hits_upper_bound\": hits_upper,\n \"diag_value_error_y1\": interp(V, 1.0) - float(V_closed(1.0)),\n \"diag_closed_form_A\": float(A), \"diag_closed_form_B\": float(B),\n \"diag_vfi_error_bound_beta_over_1mbeta_times_final_change\": float(beta / (1 - beta) * sup_change),\n}\nos.makedirs(OUT, exist_ok=True)\nwith open(os.path.join(OUT, \"results.json\"), \"w\") as f:\n json.dump(res, f, indent=2)\nwith open(os.path.join(OUT, \"exclusions.csv\"), \"w\") as f:\n f.write(\"step,rule,n_before,n_after,n_removed,rationale\\n\")\n f.write(\"1,none (all parameter rows used),%d,%d,0,model.csv contains only parameters; nothing excluded\\n\" % (len(rows), len(rows)))\nprint(json.dumps({k: v for k, v in res.items() if k != \"data_issues\"}, indent=1))\nEOF\n~/wp29/venv/bin/python out/analysis.py","description":"Write and run analysis script"},"caller":{"type":"direct"}}],"container":null,"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":156,"cache_read_input_tokens":12491,"output_tokens":2558,"output_tokens_details":{"thinking_tokens":23},"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":156},"inference_geo":"global","iterations":[],"speed":"standard","fallback_credit":null},"input_transformations":[],"diagnostics":null,"context_management":null},"apiBlockIndex":1,"requestId":"req_011CgXoaLQHgBrjmdJ4wev5w","requestRef":"e66ed29f-926b-4ee9-af56-f1d0eb3045de","requestedModel":"claude-opus-5-5","type":"assistant","uuid":"2f574904-0eee-42c2-8a76-a20c896cae13","timestamp":"2026-10-30T04:38:45.175Z","effort":"medium","perTurnEffort":"medium","userType":"external","entrypoint":"sdk-cli","cwd":"/Users/simon-pierreboucher/wp29/runs/RC0127","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","version":"2.1.314","gitBranch":"HEAD"}46{"parentUuid":"2f574904-0eee-42c2-8a76-a20c896cae13","isSidechain":false,"promptId":"a3bfe923-1b21-4947-b786-8dd22198b40e","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_017yNSGBvBS62SXMz3ih4Zbp","type":"tool_result","content":"{\n \"task_id\": \"F5-conf-04\",\n \"c_closed_y05\": 0.329,\n \"c_closed_y1\": 0.658,\n \"c_closed_y2\": 1.316,\n \"c_num_y05\": 0.32881774872035086,\n \"c_num_y1\": 0.6589935200017671,\n \"c_num_y2\": 1.309625047452993,\n \"max_abs_error_policy\": 0.006374952547007151,\n \"value_closed_y1\": -19.524412221722393,\n \"value_num_y1\": -19.52475624982261,\n \"savings_rate_closed_form\": 0.34199999999999997,\n \"contraction_modulus\": 0.95,\n \"grid_points_used\": 400,\n \"n_iterations\": 361,\n \"final_sup_change\": 9.996650618404601e-09,\n \"feasibility\": \"complete\",\n \"feasibility_reason\": null,\n \"n_input_rows\": {\n \"model.csv\": 10\n },\n \"n_analysed\": 400,\n \"random_seed\": null,\n \"diag_grid_log_step\": 0.011541779914757022,\n \"diag_max_abs_policy_error_on_grid\": 0.02512152290513381,\n \"diag_max_abs_value_error_on_grid\": 0.0004835155258184898,\n \"diag_policy_hits_lower_bound\": 0,\n \"diag_policy_hits_upper_bound\": 0,\n \"diag_value_error_y1\": -0.0003440281002156098,\n \"diag_closed_form_A\": -19.524412221722393,\n \"diag_closed_form_B\": 1.519756838905775,\n \"diag_vfi_error_bound_beta_over_1mbeta_times_final_change\": 1.8993636174968724e-07\n}","is_error":false}]},"uuid":"52248c3f-38c7-411c-aa6f-2412aa4d5caf","timestamp":"2026-10-30T04:38:45.263Z","toolUseResult":{"stdout":"{\n \"task_id\": \"F5-conf-04\",\n \"c_closed_y05\": 0.329,\n \"c_closed_y1\": 0.658,\n \"c_closed_y2\": 1.316,\n \"c_num_y05\": 0.32881774872035086,\n \"c_num_y1\": 0.6589935200017671,\n \"c_num_y2\": 1.309625047452993,\n \"max_abs_error_policy\": 0.006374952547007151,\n \"value_closed_y1\": -19.524412221722393,\n \"value_num_y1\": -19.52475624982261,\n \"savings_rate_closed_form\": 0.34199999999999997,\n \"contraction_modulus\": 0.95,\n \"grid_points_used\": 400,\n \"n_iterations\": 361,\n \"final_sup_change\": 9.996650618404601e-09,\n \"feasibility\": \"complete\",\n \"feasibility_reason\": null,\n \"n_input_rows\": {\n \"model.csv\": 10\n },\n \"n_analysed\": 400,\n \"random_seed\": null,\n \"diag_grid_log_step\": 0.011541779914757022,\n \"diag_max_abs_policy_error_on_grid\": 0.02512152290513381,\n \"diag_max_abs_value_error_on_grid\": 0.0004835155258184898,\n \"diag_policy_hits_lower_bound\": 0,\n \"diag_policy_hits_upper_bound\": 0,\n \"diag_value_error_y1\": -0.0003440281002156098,\n \"diag_closed_form_A\": -19.524412221722393,\n \"diag_closed_form_B\": 1.519756838905775,\n \"diag_vfi_error_bound_beta_over_1mbeta_times_final_change\": 1.8993636174968724e-07\n}","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sandboxed":false,"sourceToolAssistantUUID":"2f574904-0eee-42c2-8a76-a20c896cae13","permissionDecision":{"decision":"accept","source":"config","reasonType":"rule","ruleSource":"cliArg"},"userType":"external","entrypoint":"sdk-cli","cwd":"/Users/simon-pierreboucher/wp29/runs/RC0127","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","version":"2.1.314","gitBranch":"HEAD"}47{"type":"api-request-blob","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","hash":"ce376d4eb96d80df844e31b1dd50a6f097b2ee34552039a287c5ff9ff55af9d0","message":{"role":"assistant","content":[{"type":"thinking","thinking":"","signature":"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"},{"type":"tool_use","id":"toolu_017yNSGBvBS62SXMz3ih4Zbp","name":"Bash","input":{"command":"cat > out/analysis.py <<'EOF'\n\"\"\"F5-conf-04: VFI vs closed form, optimal growth with log utility.\nRun from workspace root: ~/wp29/venv/bin/python out/analysis.py\nReads only data/model.csv; deterministic (no randomness).\"\"\"\nimport json, os, csv\nimport numpy as np\n\nROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))\nDATA = os.path.join(ROOT, \"data\", \"model.csv\")\nOUT = os.path.join(ROOT, \"out\")\n\nwith open(DATA, newline=\"\") as f:\n rows = list(csv.DictReader(f))\np = {r[\"parameter\"]: r[\"value\"] for r in rows}\nalpha = float(p[\"alpha\"]); beta = float(p[\"beta\"])\ny_min = float(p[\"y_min\"]); y_max = float(p[\"y_max\"]); N = int(float(p[\"grid_points\"]))\nassert p[\"grid_spacing\"].strip() == \"log\"\ntol = float(p[\"vfi_tolerance\"])\neval_y = [float(p[\"eval_y_1\"]), float(p[\"eval_y_2\"]), float(p[\"eval_y_3\"])]\n\n# ---------------- closed form (guess-and-verify V = A + B ln y) ----------------\nab = alpha * beta\nB = 1.0 / (1.0 - ab)\nA = (np.log(1.0 - ab) + ab / (1.0 - ab) * np.log(ab)) / (1.0 - beta)\nc_closed = lambda y: (1.0 - ab) * np.asarray(y)\nV_closed = lambda y: A + B * np.log(y)\nsavings_rate = ab\n\n# ---------------- VFI on prescribed grid (discrete choice of y' on grid) --------\ngrid = np.exp(np.linspace(np.log(y_min), np.log(y_max), N))\nk_needed = grid ** (1.0 / alpha) # capital needed to reach y' = grid[j]\nC = grid[:, None] - k_needed[None, :] # c(i, j) = y_i - y'_j^(1/alpha)\nfeasible = C > 0\nU = np.full_like(C, -np.inf)\nU[feasible] = np.log(C[feasible])\nassert feasible.any(axis=1).all(), \"some grid point has no feasible choice\"\n\nV = np.zeros(N)\nn_iter = 0\nsup_change = np.inf\nmax_iter = 100000\nwhile sup_change >= tol and n_iter < max_iter:\n W = U + beta * V[None, :]\n V_new = W.max(axis=1)\n sup_change = float(np.max(np.abs(V_new - V)))\n V = V_new\n n_iter += 1\nconverged = sup_change < tol\npol_j = (U + beta * V[None, :]).argmax(axis=1)\nc_pol = grid - k_needed[pol_j]\n\n# boundary diagnostics: does the optimal choice ever hit grid edges?\nhits_lower = int(np.sum(pol_j == 0)); hits_upper = int(np.sum(pol_j == N - 1))\n\n# interpolation at evaluation points: linear in ln y (grid is uniform in ln y)\nlg = np.log(grid)\ninterp = lambda f, y: float(np.interp(np.log(y), lg, f))\nc_num = [interp(c_pol, y) for y in eval_y]\nc_cl = [float(c_closed(y)) for y in eval_y]\non_grid = [bool(np.any(np.isclose(grid, y, rtol=1e-12, atol=0))) for y in eval_y]\nmax_err = float(max(abs(a - b) for a, b in zip(c_num, c_cl)))\n\n# whole-grid diagnostics (for report only)\ngrid_policy_err = float(np.max(np.abs(c_pol - c_closed(grid))))\ngrid_value_err = float(np.max(np.abs(V - V_closed(grid))))\n\ndata_issues = []\nif not all(on_grid):\n data_issues.append({\"issue\": \"Evaluation points %s are not grid nodes of the log-spaced grid\" %\n [y for y, o in zip(eval_y, on_grid) if not o],\n \"handling\": \"VFI policy and value interpolated linearly in ln(y) between adjacent grid nodes\"})\ndata_issues.append({\"issue\": \"Design choice: the choice variable is next-period output y' restricted to the same grid (discrete-choice VFI); consumption c = y - y'^(1/alpha)\",\n \"handling\": \"No deviation from prescribed grid/parameters; discretisation error of order of the grid spacing is reported, not corrected\"})\n\nfeas = \"complete\" if converged else \"partial\"\nres = {\n \"task_id\": \"F5-conf-04\",\n \"c_closed_y05\": c_cl[0], \"c_closed_y1\": c_cl[1], \"c_closed_y2\": c_cl[2],\n \"c_num_y05\": c_num[0], \"c_num_y1\": c_num[1], \"c_num_y2\": c_num[2],\n \"max_abs_error_policy\": max_err,\n \"value_closed_y1\": float(V_closed(1.0)),\n \"value_num_y1\": interp(V, 1.0),\n \"savings_rate_closed_form\": float(savings_rate),\n \"contraction_modulus\": float(beta),\n \"grid_points_used\": int(N),\n \"n_iterations\": int(n_iter),\n \"final_sup_change\": float(sup_change),\n \"feasibility\": feas,\n \"feasibility_reason\": None if converged else \"VFI did not reach tolerance within max_iter\",\n \"data_issues\": data_issues,\n \"n_input_rows\": {\"model.csv\": len(rows)},\n \"n_analysed\": int(N),\n \"random_seed\": None,\n # supplementary diagnostics\n \"diag_grid_log_step\": float(lg[1] - lg[0]),\n \"diag_max_abs_policy_error_on_grid\": grid_policy_err,\n \"diag_max_abs_value_error_on_grid\": grid_value_err,\n \"diag_policy_hits_lower_bound\": hits_lower,\n \"diag_policy_hits_upper_bound\": hits_upper,\n \"diag_value_error_y1\": interp(V, 1.0) - float(V_closed(1.0)),\n \"diag_closed_form_A\": float(A), \"diag_closed_form_B\": float(B),\n \"diag_vfi_error_bound_beta_over_1mbeta_times_final_change\": float(beta / (1 - beta) * sup_change),\n}\nos.makedirs(OUT, exist_ok=True)\nwith open(os.path.join(OUT, \"results.json\"), \"w\") as f:\n json.dump(res, f, indent=2)\nwith open(os.path.join(OUT, \"exclusions.csv\"), \"w\") as f:\n f.write(\"step,rule,n_before,n_after,n_removed,rationale\\n\")\n f.write(\"1,none (all parameter rows used),%d,%d,0,model.csv contains only parameters; nothing excluded\\n\" % (len(rows), len(rows)))\nprint(json.dumps({k: v for k, v in res.items() if k != \"data_issues\"}, indent=1))\nEOF\n~/wp29/venv/bin/python out/analysis.py","description":"Write and run analysis script"}}]}}48{"type":"api-request","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","id":"3063ef6b-bb63-46cf-ba87-52ce47fdfe9c","timestamp":"2026-10-30T04:38:45.266Z","version":"2.1.314","querySource":"sdk","shapeHash":"8be9f6249bd479bd1dcf91f3d6843ff122d73c436ec2149f130d40f309a6d131","params":{"model":"claude-opus-5-5","betas":["claude-code-20250219","interleaved-thinking-2025-05-14","context-management-2025-06-27","prompt-caching-scope-2026-01-05","per-turn-control-2026-07-01","thinking-token-count-2026-05-13","mid-conversation-system-clear-at-2026-08-21","effort-2025-11-24","thinking-binding-controls-2026-08-01","thinking-display-updates-2026-08-18","cache-diagnosis-2026-04-07"],"max_tokens":128000,"thinking":{"type":"adaptive","display":"updates"},"context_management":{"edits":[{"type":"clear_thinking_20251015","keep":"all"}]},"output_config":{"effort":"medium"}},"base":"e66ed29f-926b-4ee9-af56-f1d0eb3045de","keep":14,"tail":["ce376d4eb96d80df844e31b1dd50a6f097b2ee34552039a287c5ff9ff55af9d0","6bdf77cb8748a8f2a0559d4bb99ae1141127aeabb7a23464c211948e954e7068"],"cacheControl":[{"path":["system",0],"value":{"type":"ephemeral"}},{"path":["system",1],"value":{"type":"ephemeral"}},{"path":["messages",15,"content",0],"value":{"type":"ephemeral"}}],"requestDigest":"897c0aaef3ab607dc021e5273bfade8ac195dc7751f9358d8e6aa4c39f0f9c44"}49{"parentUuid":"52248c3f-38c7-411c-aa6f-2412aa4d5caf","isSidechain":false,"message":{"model":"claude-opus-5-5","id":"msg_011CgXobcPW6hg8pbftYSy8f","type":"message","role":"assistant","content":[{"type":"thinking","thinking":"","signature":"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"}],"container":null,"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":3148,"cache_read_input_tokens":12647,"output_tokens":623,"output_tokens_details":{"thinking_tokens":108},"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":3148},"inference_geo":"global","iterations":[],"speed":"standard","fallback_credit":null},"input_transformations":[],"diagnostics":null,"context_management":null},"thinkingDurationMs":1119,"thinkingDisplay":"updates","apiBlockIndex":0,"requestId":"req_011CgXobc88gDVow6q4HmeKM","requestRef":"3063ef6b-bb63-46cf-ba87-52ce47fdfe9c","requestedModel":"claude-opus-5-5","type":"assistant","uuid":"fa856d0f-3681-41cb-b836-32c7a4be338b","timestamp":"2026-10-30T04:38:47.957Z","effort":"medium","perTurnEffort":"medium","userType":"external","entrypoint":"sdk-cli","cwd":"/Users/simon-pierreboucher/wp29/runs/RC0127","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","version":"2.1.314","gitBranch":"HEAD"}50{"parentUuid":"fa856d0f-3681-41cb-b836-32c7a4be338b","isSidechain":false,"message":{"model":"claude-opus-5-5","id":"msg_011CgXobcPW6hg8pbftYSy8f","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01VBSHtXa2kYVHJ3Mo9zWkFa","name":"Bash","input":{"command":"cat out/results.json | head -40 | grep -A3 data_issues; cp out/results.json /tmp/r1.json; rm out/results.json; ~/wp29/venv/bin/python out/analysis.py >/dev/null; cmp out/results.json /tmp/r1.json && echo IDENTICAL\n~/wp29/venv/bin/python - <<'EOF'\nimport json,numpy as np\nr=json.load(open('out/results.json'))\na,b=.36,.95\n# verify Bellman for closed form numerically by brute force at y=1\nA,B=r['diag_closed_form_A'],r['diag_closed_form_B']\nc=np.linspace(1e-6,1-1e-6,2_000_001); y=1.0\nrhs=np.log(c)+b*(A+B*a*np.log(y-c)); i=rhs.argmax()\nprint(\"Bellman check y=1: max rhs\",rhs[i],\"V\",A,\"argmax c\",c[i])\nprint(\"max err recompute\", max(abs(r['c_num_y05']-r['c_closed_y05']),abs(r['c_num_y1']-r['c_closed_y1']),abs(r['c_num_y2']-r['c_closed_y2'])))\nprint(\"steady state y*\", (a*b)**(a/(1-a)))\nEOF","description":"Reproducibility and consistency checks"},"caller":{"type":"direct"}}],"container":null,"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":3148,"cache_read_input_tokens":12647,"output_tokens":623,"output_tokens_details":{"thinking_tokens":108},"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":3148},"inference_geo":"global","iterations":[],"speed":"standard","fallback_credit":null},"input_transformations":[],"diagnostics":null,"context_management":null},"apiBlockIndex":1,"requestId":"req_011CgXobc88gDVow6q4HmeKM","requestRef":"3063ef6b-bb63-46cf-ba87-52ce47fdfe9c","requestedModel":"claude-opus-5-5","type":"assistant","uuid":"10b5bbc5-5c39-4f04-a103-e1e418ea02c5","timestamp":"2026-10-30T04:38:51.581Z","effort":"medium","perTurnEffort":"medium","userType":"external","entrypoint":"sdk-cli","cwd":"/Users/simon-pierreboucher/wp29/runs/RC0127","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","version":"2.1.314","gitBranch":"HEAD"}51{"parentUuid":"10b5bbc5-5c39-4f04-a103-e1e418ea02c5","isSidechain":false,"promptId":"a3bfe923-1b21-4947-b786-8dd22198b40e","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01VBSHtXa2kYVHJ3Mo9zWkFa","type":"tool_result","content":" \"data_issues\": [\n {\n \"issue\": \"Evaluation points [0.5, 1.0, 2.0] are not grid nodes of the log-spaced grid\",\n \"handling\": \"VFI policy and value interpolated linearly in ln(y) between adjacent grid nodes\"\nIDENTICAL\nBellman check y=1: max rhs -19.524412221722507 V -19.524412221722393 argmax c 0.658000183999\nmax err recompute 0.006374952547007151\nsteady state y* 0.5468770327603131","is_error":false}]},"uuid":"bb5c40d0-9358-4905-be61-64a69e6c0dbc","timestamp":"2026-10-30T04:38:51.757Z","toolUseResult":{"stdout":" \"data_issues\": [\n {\n \"issue\": \"Evaluation points [0.5, 1.0, 2.0] are not grid nodes of the log-spaced grid\",\n \"handling\": \"VFI policy and value interpolated linearly in ln(y) between adjacent grid nodes\"\nIDENTICAL\nBellman check y=1: max rhs -19.524412221722507 V -19.524412221722393 argmax c 0.658000183999\nmax err recompute 0.006374952547007151\nsteady state y* 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out/results.json | head -40 | grep -A3 data_issues; cp out/results.json /tmp/r1.json; rm out/results.json; ~/wp29/venv/bin/python out/analysis.py >/dev/null; cmp out/results.json /tmp/r1.json && echo IDENTICAL\n~/wp29/venv/bin/python - <<'EOF'\nimport json,numpy as np\nr=json.load(open('out/results.json'))\na,b=.36,.95\n# verify Bellman for closed form numerically by brute force at y=1\nA,B=r['diag_closed_form_A'],r['diag_closed_form_B']\nc=np.linspace(1e-6,1-1e-6,2_000_001); y=1.0\nrhs=np.log(c)+b*(A+B*a*np.log(y-c)); i=rhs.argmax()\nprint(\"Bellman check y=1: max rhs\",rhs[i],\"V\",A,\"argmax c\",c[i])\nprint(\"max err recompute\", max(abs(r['c_num_y05']-r['c_closed_y05']),abs(r['c_num_y1']-r['c_closed_y1']),abs(r['c_num_y2']-r['c_closed_y2'])))\nprint(\"steady state y*\", (a*b)**(a/(1-a)))\nEOF","description":"Reproducibility and consistency 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> out/state/data_audit.md <<'EOF'\n# Data audit (P1)\n| file | sha256 | rows | cols |\n|---|---|---|---|\n| data/model.csv | 098123961451e4f9a2e76afdbc83aec78066fc713d0645659c09b77b1636195b | 10 | 3 (parameter, value, description) |\n\nMatches bundle.json hash. Parameters: alpha=0.36, beta=0.95, y_min=0.05, y_max=5.0, grid_points=400, grid_spacing=log, vfi_tolerance=1e-8, eval_y = 0.5, 1.0, 2.0.\nNo missing values, no duplicate parameter names, no dates (theoretical parameters). Units: output units; utils for value.\nAnomalies: none. 0<alpha<1, 0<beta<1 as required for the closed form and contraction.\nNote: the eval points are not grid nodes (log step 0.01154 from ln 0.05) -> interpolation needed (recorded in data_issues).\nGrid adequacy: closed-form optimal y' = (alpha*beta*y)^alpha ranges over [0.231, 1.21] for y in [0.05, 5], inside the grid; steady state y* = 0.547. Confirmed in run: policy never hits grid bounds.\nInformation-availability: no violating inputs; only model.csv is used.\nExclusions: none (out/exclusions.csv, 10 -> 10 rows).\nEOF\ncat > out/state/checks.md <<'EOF'\n# Verification checks (P4)\n1. Reproducibility: deleted out/results.json, re-ran analysis.py, `cmp` -> byte-identical. PASS\n2. Closed form satisfies Bellman: brute-force maximisation of ln c + beta*(A + B*alpha*ln(1-c)) at y=1 over 2,000,001 points gives max -19.5244122217225 vs V(1) = A = -19.5244122217224, argmax c = 0.658000 = (1-alpha*beta). PASS\n3. max_abs_error_policy recomputed from the three c_num/c_closed pairs = 0.0063750 (matches). PASS\n4. VFI converged: final_sup_change 9.997e-9 < tol 1e-8, n_iterations 361; theoretical error bound beta/(1-beta)*final change = 1.9e-7 utils. PASS\n5. Policy never at grid bounds (diag_policy_hits_lower/upper_bound = 0): no truncation. PASS\n6. Magnitudes vs baseline: VFI implied savings rates 1 - c_num/y = 0.3424, 0.3410, 0.3452 vs closed-form 0.342; value error at y=1 = -3.4e-4 utils, consistent with discrete-choice discretisation (VFI value <= true value is expected since the choice set is restricted; observed negative). PASS\n7. Counts: n_input_rows 10 = rows in model.csv; n_analysed = grid_points_used = 400. PASS\nEOF\n~/wp29/venv/bin/python -c \"\nimport json;r=json.load(open('out/results.json'))\nfor y,k in [(0.5,'05'),(1,'1'),(2,'2')]: print(1-r['c_num_y'+k]/y)\"","description":"Write audit and checks; verify savings rates"},"caller":{"type":"direct"}}],"container":null,"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":804,"cache_read_input_tokens":15795,"output_tokens":1232,"output_tokens_details":{"thinking_tokens":41},"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":804},"inference_geo":"global","iterations":[],"speed":"standard","fallback_credit":null},"input_transformations":[],"diagnostics":null,"context_management":null},"apiBlockIndex":1,"requestId":"req_011CgXoc5yS79eeA7CxJg3ic","requestRef":"2e3e92ec-0e7b-41aa-96dc-9dc8b43b19e6","requestedModel":"claude-opus-5-5","type":"assistant","uuid":"43d33c69-efec-4cea-937f-ee333f638cdf","timestamp":"2026-10-30T04:39:03.421Z","effort":"medium","perTurnEffort":"medium","userType":"external","entrypoint":"sdk-cli","cwd":"/Users/simon-pierreboucher/wp29/runs/RC0127","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","version":"2.1.314","gitBranch":"HEAD"}58{"parentUuid":"43d33c69-efec-4cea-937f-ee333f638cdf","isSidechain":false,"promptId":"a3bfe923-1b21-4947-b786-8dd22198b40e","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01PGga4CGVKwsTszS4FYyiWg","type":"tool_result","content":"0.3423645025592983\n0.34100647999823286\n0.34518747627350355","is_error":false}]},"uuid":"1bbd84b1-41a3-4b32-b7e5-bed1a63fdb43","timestamp":"2026-10-30T04:39:03.459Z","toolUseResult":{"stdout":"0.3423645025592983\n0.34100647999823286\n0.34518747627350355","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sandboxed":false,"sourceToolAssistantUUID":"43d33c69-efec-4cea-937f-ee333f638cdf","permissionDecision":{"decision":"accept","source":"config","reasonType":"rule","ruleSource":"cliArg"},"userType":"external","entrypoint":"sdk-cli","cwd":"/Users/simon-pierreboucher/wp29/runs/RC0127","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","version":"2.1.314","gitBranch":"HEAD"}59{"type":"api-request-blob","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","hash":"2fc78dab29db5e3256382902316bfb98279948bac7e9140ecad2b7b733762bfb","message":{"role":"assistant","content":[{"type":"thinking","thinking":"","signature":"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"},{"type":"tool_use","id":"toolu_01PGga4CGVKwsTszS4FYyiWg","name":"Bash","input":{"command":"cat > out/state/data_audit.md <<'EOF'\n# Data audit (P1)\n| file | sha256 | rows | cols |\n|---|---|---|---|\n| data/model.csv | 098123961451e4f9a2e76afdbc83aec78066fc713d0645659c09b77b1636195b | 10 | 3 (parameter, value, description) |\n\nMatches bundle.json hash. Parameters: alpha=0.36, beta=0.95, y_min=0.05, y_max=5.0, grid_points=400, grid_spacing=log, vfi_tolerance=1e-8, eval_y = 0.5, 1.0, 2.0.\nNo missing values, no duplicate parameter names, no dates (theoretical parameters). Units: output units; utils for value.\nAnomalies: none. 0<alpha<1, 0<beta<1 as required for the closed form and contraction.\nNote: the eval points are not grid nodes (log step 0.01154 from ln 0.05) -> interpolation needed (recorded in data_issues).\nGrid adequacy: closed-form optimal y' = (alpha*beta*y)^alpha ranges over [0.231, 1.21] for y in [0.05, 5], inside the grid; steady state y* = 0.547. Confirmed in run: policy never hits grid bounds.\nInformation-availability: no violating inputs; only model.csv is used.\nExclusions: none (out/exclusions.csv, 10 -> 10 rows).\nEOF\ncat > out/state/checks.md <<'EOF'\n# Verification checks (P4)\n1. Reproducibility: deleted out/results.json, re-ran analysis.py, `cmp` -> byte-identical. PASS\n2. Closed form satisfies Bellman: brute-force maximisation of ln c + beta*(A + B*alpha*ln(1-c)) at y=1 over 2,000,001 points gives max -19.5244122217225 vs V(1) = A = -19.5244122217224, argmax c = 0.658000 = (1-alpha*beta). PASS\n3. max_abs_error_policy recomputed from the three c_num/c_closed pairs = 0.0063750 (matches). PASS\n4. VFI converged: final_sup_change 9.997e-9 < tol 1e-8, n_iterations 361; theoretical error bound beta/(1-beta)*final change = 1.9e-7 utils. PASS\n5. Policy never at grid bounds (diag_policy_hits_lower/upper_bound = 0): no truncation. PASS\n6. Magnitudes vs baseline: VFI implied savings rates 1 - c_num/y = 0.3424, 0.3410, 0.3452 vs closed-form 0.342; value error at y=1 = -3.4e-4 utils, consistent with discrete-choice discretisation (VFI value <= true value is expected since the choice set is restricted; observed negative). PASS\n7. Counts: n_input_rows 10 = rows in model.csv; n_analysed = grid_points_used = 400. PASS\nEOF\n~/wp29/venv/bin/python -c \"\nimport json;r=json.load(open('out/results.json'))\nfor y,k in [(0.5,'05'),(1,'1'),(2,'2')]: print(1-r['c_num_y'+k]/y)\"","description":"Write audit and checks; verify savings 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identical within tolerance\nreceipt: /Users/simon-pierreboucher/wp29/runs/RC0127/out/state/gate_receipts/20261030T043909.783399Z.json","is_error":true,"tool_use_id":"toolu_01Vv1csHsR99QbGSoMffthRD"}]},"uuid":"9ac32128-2bbc-46cf-816d-20edf46abd28","timestamp":"2026-10-30T04:39:09.789Z","toolUseResult":"Error: Exit code 1\nPGAR GATE pgar_gate/1.0 — FAILED (10 of 35 checks failed)\n [ok] file:out/results.json: present\n [FAIL] file:out/report.md: missing or empty\n [ok] file:out/analysis.py: present\n [FAIL] file:out/claims.json: missing or empty\n [ok] results_json: parsed\n [ok] key:task_id: ok\n [ok] key:c_closed_y05: ok\n [ok] key:c_closed_y1: ok\n [ok] key:c_closed_y2: ok\n [ok] key:c_num_y05: ok\n [ok] key:c_num_y1: ok\n [ok] key:c_num_y2: ok\n [ok] key:max_abs_error_policy: ok\n [ok] key:value_closed_y1: ok\n [ok] key:value_num_y1: ok\n [ok] key:savings_rate_closed_form: ok\n [ok] key:contraction_modulus: ok\n [ok] key:final_sup_change: ok\n [ok] key:grid_points_used: ok\n [ok] key:n_iterations: ok\n [ok] key:feasibility: ok\n [ok] key:feasibility_reason: ok\n [ok] key:data_issues: ok\n [ok] key:n_input_rows: ok\n [ok] key:n_analysed: ok\n [ok] key:random_seed: ok\n [FAIL] section:Question: heading not found\n [FAIL] section:Data and exclusions: heading not found\n [FAIL] section:Method: heading not found\n [FAIL] section:Results: heading not found\n [FAIL] section:Uncertainty: heading not found\n [FAIL] section:Limitations and open issues: heading not found\n [FAIL] claims_json: out/claims.json missing\n [FAIL] phase_ledger: phases not terminal: ['P4', 'P5']\n [ok] reproducibility: regenerated in 0.1s; 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discrete-choice VFI on prescribed grid, log-linear interpolation at eval points. P4 checks pass; running gate.\" >> out/state/log.md\n~/wp29/venv/bin/python ~/wp29/gates/pgar_gate.py .","description":"Update ledger and run gate"}}]}}65{"type":"api-request","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","id":"9b6dbd68-bda9-4cab-af79-7c65a8f08c22","timestamp":"2026-10-30T04:39:09.792Z","version":"2.1.314","querySource":"sdk","shapeHash":"8be9f6249bd479bd1dcf91f3d6843ff122d73c436ec2149f130d40f309a6d131","params":{"model":"claude-opus-5-5","betas":["claude-code-20250219","interleaved-thinking-2025-05-14","context-management-2025-06-27","prompt-caching-scope-2026-01-05","per-turn-control-2026-07-01","thinking-token-count-2026-05-13","mid-conversation-system-clear-at-2026-08-21","effort-2025-11-24","thinking-binding-controls-2026-08-01","thinking-display-updates-2026-08-18","cache-diagnosis-2026-04-07"],"max_tokens":128000,"thinking":{"type":"adaptive","display":"updates"},"context_management":{"edits":[{"type":"clear_thinking_20251015","keep":"all"}]},"output_config":{"effort":"medium"}},"base":"ea5b2538-7c36-40bc-a915-e5b7e88bf29f","keep":20,"tail":["0e2796baf61c7d6f5291bdc419013c9f927c4697f832aa3def9a8e220213d3ce","faa1947163580e3e45853b559132687f2a1cc23101e04de95d9fe044fe81c38f"],"cacheControl":[{"path":["system",0],"value":{"type":"ephemeral"}},{"path":["system",1],"value":{"type":"ephemeral"}},{"path":["messages",21,"content",0],"value":{"type":"ephemeral"}}],"requestDigest":"f4ef33d775e1447b3098ec6e71ee6c4d95af373caa94ac4cf92cc2b36bebce46"}66{"parentUuid":"9ac32128-2bbc-46cf-816d-20edf46abd28","isSidechain":false,"message":{"model":"claude-opus-5-5","id":"msg_011CgXodRKYzVT2dwRidaX3u","type":"message","role":"assistant","content":[{"type":"thinking","thinking":"","signature":"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"}],"container":null,"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":1384,"cache_read_input_tokens":17862,"output_tokens":3755,"output_tokens_details":{"thinking_tokens":42},"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":1384},"inference_geo":"global","iterations":[],"speed":"standard","fallback_credit":null},"input_transformations":[],"diagnostics":null,"context_management":null},"thinkingDurationMs":563,"thinkingDisplay":"updates","apiBlockIndex":0,"requestId":"req_011CgXodR1wUEMW3DDkN9jRa","requestRef":"9b6dbd68-bda9-4cab-af79-7c65a8f08c22","requestedModel":"claude-opus-5-5","type":"assistant","uuid":"db0eefa3-a861-4dfa-aad0-483a4a98b667","timestamp":"2026-10-30T04:39:12.546Z","effort":"medium","perTurnEffort":"medium","userType":"external","entrypoint":"sdk-cli","cwd":"/Users/simon-pierreboucher/wp29/runs/RC0127","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","version":"2.1.314","gitBranch":"HEAD"}67{"parentUuid":"db0eefa3-a861-4dfa-aad0-483a4a98b667","isSidechain":false,"message":{"model":"claude-opus-5-5","id":"msg_011CgXodRKYzVT2dwRidaX3u","type":"message","role":"assistant","content":[{"type":"text","text":"Gate failures at this point are only the P5 deliverables; the P4 contract and reproducibility checks pass. Now the report and claims."}],"container":null,"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":1384,"cache_read_input_tokens":17862,"output_tokens":3755,"output_tokens_details":{"thinking_tokens":42},"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":1384},"inference_geo":"global","iterations":[],"speed":"standard","fallback_credit":null},"input_transformations":[],"diagnostics":null,"context_management":null},"apiBlockIndex":1,"requestId":"req_011CgXodR1wUEMW3DDkN9jRa","requestRef":"9b6dbd68-bda9-4cab-af79-7c65a8f08c22","requestedModel":"claude-opus-5-5","type":"assistant","uuid":"76327c0c-d40a-4256-9511-3e8f72e2992e","timestamp":"2026-10-30T04:39:12.546Z","effort":"medium","perTurnEffort":"medium","userType":"external","entrypoint":"sdk-cli","cwd":"/Users/simon-pierreboucher/wp29/runs/RC0127","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","version":"2.1.314","gitBranch":"HEAD"}68{"parentUuid":"76327c0c-d40a-4256-9511-3e8f72e2992e","isSidechain":false,"message":{"model":"claude-opus-5-5","id":"msg_011CgXodRKYzVT2dwRidaX3u","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01VinAgpaY7jB9WpmvHmR7LQ","name":"Bash","input":{"command":"cat > out/report.md <<'EOF'\n# F5-conf-04 — VFI vs closed-form policy, optimal growth with log utility\n\n## Question\nA planner maximises Σ β^t ln c_t subject to y_{t+1} = (y_t − c_t)^α (Cobb–Douglas, full depreciation, productivity 1). We compare the closed-form solution of V(y) = max_{0<c<y} {ln c + β V((y−c)^α)} with value-function iteration (VFI) on the prescribed grid, at y = 0.5, 1, 2, and at V(1).\n\n## Data and exclusions\nOnly `data/model.csv` (10 parameter rows, `n_input_rows`) is used: α = 0.36, β = 0.95, a grid of 400 points equally spaced in ln y on [0.05, 5] (`grid_points_used`, `n_analysed`), VFI tolerance 1e-8, evaluation points 0.5, 1.0, 2.0. Nothing was excluded (`out/exclusions.csv`, 10 → 10). The SHA-256 matches the bundle manifest (`out/state/data_audit.md`). None of the evaluation points is a grid node; see `data_issues`.\n\n## Method\n**Closed form (guess and verify).** Guess V(y) = A + B ln y. The right-hand side is ln c + β(A + Bα ln(y−c)). The first-order condition 1/c = αβB/(y−c) gives c = y/(1+αβB). Matching the ln y coefficients gives B = 1 + αβB, so B = 1/(1−αβ). Then c(y) = (1−αβ) y and the savings rate is (y−c)/y = αβ. Matching the constants gives A = [ln(1−αβ) + (αβ/(1−αβ)) ln(αβ)]/(1−β). With these parameters, B = 1.5198 (`diag_closed_form_B`) and A = −19.5244 (`diag_closed_form_A`). This rests on four assumptions: log utility; Cobb–Douglas technology y' = k^α with 0<α<1; full depreciation, with productivity normalised to 1; and an interior solution (0 < c < y, guaranteed because ln c → −∞ at c→0 and ln(y−c) → −∞ at c→y). Both functions are concave, so the first-order condition is sufficient. As a numerical check, brute-force maximisation of the Bellman right-hand side at y = 1 recovers V(1) and c = 0.658 to about 1e-13 (`out/state/checks.md`, item 2).\n\n**Contraction.** The Bellman operator T is monotone, and it discounts: T(V + a) = TV + βa. By Blackwell's sufficient conditions it is therefore a contraction in the sup norm with modulus β = 0.95 (`contraction_modulus`). One caveat: ln is unbounded, so on all of (0, ∞) the argument needs a weighted norm. On the compact grid used here, every per-period utility is finite and the bounded-function argument applies directly.\n\n**VFI.** We use discrete-choice VFI on the prescribed grid. For each grid point y_i, the choice is next-period output y'_j on the same grid, with consumption c_ij = y_i − (y'_j)^{1/α}. Infeasible pairs (c ≤ 0) get −∞. Iteration starts at V_0 = 0 and stops when ‖V_{n+1} − V_n‖_∞ < 1e-8. The closed form is never used inside the VFI. The policy c(y_i) comes from the argmax. Values at the off-grid evaluation points are linear interpolations in ln y between neighbouring nodes. No randomness is involved (`random_seed` = null).\n\n## Results\n| y | closed form c | VFI c |\n|---|---|---|\n| 0.5 | 0.329 (`c_closed_y05`) | 0.32882 (`c_num_y05`) |\n| 1.0 | 0.658 (`c_closed_y1`) | 0.65899 (`c_num_y1`) |\n| 2.0 | 1.316 (`c_closed_y2`) | 1.30963 (`c_num_y2`) |\n\n- The largest absolute policy discrepancy across the three points is 0.00637 (`max_abs_error_policy`), at y = 2. That is about 0.5% of consumption.\n- V(1) is −19.52441 from the closed form (`value_closed_y1`) and −19.52476 from VFI (`value_num_y1`), a gap of −3.4e-4 utils (`diag_value_error_y1`).\n- The closed-form savings rate is αβ = 0.342 (`savings_rate_closed_form`). This is the baseline.\n- VFI met the stopping rule after 361 iterations (`n_iterations`), with a final sup change of 9.997e-9 (`final_sup_change`). Status is `feasibility` = \"complete\".\n\n## Uncertainty\nThe model is deterministic, so there is no sampling uncertainty. The numerical error has two parts.\n1. **Iteration error.** It is bounded by β/(1−β)·‖V_n − V_{n−1}‖ = 1.9e-7 utils (`diag_vfi_error_bound_beta_over_1mbeta_times_final_change`). This is negligible.\n2. **Discretisation and interpolation error.** This part dominates. It depends on the log grid step of 0.01154 (`diag_grid_log_step`). Because y' is restricted to grid nodes, the implied capital k = y'^{1/α} moves in relative steps of about 0.0115/α ≈ 3.2%. The policy is therefore a step function, and its error is of the order of the grid spacing. Over all 400 nodes, the maximum policy error is 0.0251 (`diag_max_abs_policy_error_on_grid`), largest at high y, where absolute steps are bigger. The maximum value error is 4.8e-4 utils (`diag_max_abs_value_error_on_grid`).\n\nThe value function converges much more tightly than the policy. This is expected, because the objective is flat near its optimum.\n\n## Limitations and open issues\n- **Scope.** The validation covers a single parameter point (α = 0.36, β = 0.95), one grid (400 log-spaced points on [0.05, 5]) and one tolerance. It does not show accuracy for other parameters, grids, or for models without a closed form, such as partial depreciation or CRRA utility other than log.\n- **Grid truncation.** The bounds were checked: the optimal y' never hits a grid bound (`diag_policy_hits_lower_bound` = `diag_policy_hits_upper_bound` = 0).\n- **Off-grid evaluation.** The evaluation points 0.5, 1, 2 are not grid nodes, so the VFI numbers include interpolation error on top of the discrete-choice error (recorded in `data_issues`). A continuous-choice VFI would reduce the policy error. We did not use one, to stay within the prescribed design.\n- The discrete-choice formulation is a modelling choice made within the prescribed design, not a change to it. It is documented in `data_issues`.\nEOF\ncat > out/claims.json <<'EOF'\n[\n{\"id\":\"C1\",\"text\":\"The closed-form policy is c(y)=(1-alpha*beta)y, giving 0.329, 0.658, 1.316 at y=0.5,1,2, with a savings rate of alpha*beta=0.342.\",\"results_keys\":[\"c_closed_y05\",\"c_closed_y1\",\"c_closed_y2\",\"savings_rate_closed_form\"],\"status\":\"supported\",\"caveat\":\"Requires log utility, Cobb-Douglas technology, full depreciation and an interior solution.\"},\n{\"id\":\"C2\",\"text\":\"Discrete-choice VFI on the prescribed 400-point log grid reproduces the closed-form policy at the three evaluation points within 0.0064 (about 0.5% of consumption).\",\"results_keys\":[\"c_num_y05\",\"c_num_y1\",\"c_num_y2\",\"max_abs_error_policy\",\"grid_points_used\"],\"status\":\"supported\",\"caveat\":\"Error is mostly discretisation plus log-linear interpolation; it holds for this grid and parameter point only.\"},\n{\"id\":\"C3\",\"text\":\"The VFI value at y=1 matches the closed-form V(1)=-19.5244 to within about 3.4e-4 utils.\",\"results_keys\":[\"value_closed_y1\",\"value_num_y1\",\"diag_value_error_y1\"],\"status\":\"supported\",\"caveat\":\"Interpolated in ln y; y=1 is not a grid node.\"},\n{\"id\":\"C4\",\"text\":\"The Bellman operator is a sup-norm contraction with modulus beta=0.95, and VFI met the 1e-8 stopping rule in 361 iterations, so the iteration error is bounded by about 1.9e-7 utils.\",\"results_keys\":[\"contraction_modulus\",\"n_iterations\",\"final_sup_change\",\"diag_vfi_error_bound_beta_over_1mbeta_times_final_change\"],\"status\":\"supported\",\"caveat\":\"The contraction argument uses bounded utility on the compact grid; on the full domain, log utility needs a weighted norm.\"},\n{\"id\":\"C5\",\"text\":\"Discretisation, not iteration, dominates the numerical error: the maximum policy error over all grid nodes is 0.025 and grows with y.\",\"results_keys\":[\"diag_max_abs_policy_error_on_grid\",\"diag_grid_log_step\",\"final_sup_change\"],\"status\":\"supported\",\"caveat\":\"The claim that the error grows with y comes from the step-function structure; only the maximum is stored in the results.\"}\n]\nEOF\n~/wp29/venv/bin/python - <<'EOF'\nimport json\np=json.load(open('out/state/phases.json'))\np['P4']['status']='passed'; p['P4']['checks'].append('gate run 20261030T043909.783399Z: contract keys+reproducibility ok; failures only P5 deliverables (report/claims/ledger) not yet written')\np['P4']['notes']='receipt out/state/gate_receipts/20261030T043909.783399Z.json'\np['P5']['status']='passed'; p['P5']['checks']=['report.md with 6 sections, key citations','claims.json 5 claims referencing existing keys','final gate run (see notes)']\njson.dump(p,open('out/state/phases.json','w'),indent=1)\nEOF\necho \"- 2026-10-30 P4 passed (gate receipt 20261030T043909). P5 report/claims written; running final gate.\" >> out/state/log.md\n~/wp29/venv/bin/python ~/wp29/gates/pgar_gate.py . | grep -v \"\\[ok\\]\"","description":"Write report, claims, update ledger, run final gate"},"caller":{"type":"direct"}}],"container":null,"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":1384,"cache_read_input_tokens":17862,"output_tokens":3755,"output_tokens_details":{"thinking_tokens":42},"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":1384},"inference_geo":"global","iterations":[],"speed":"standard","fallback_credit":null},"input_transformations":[],"diagnostics":null,"context_management":null},"apiBlockIndex":2,"requestId":"req_011CgXodR1wUEMW3DDkN9jRa","requestRef":"9b6dbd68-bda9-4cab-af79-7c65a8f08c22","requestedModel":"claude-opus-5-5","type":"assistant","uuid":"53d5f296-5de9-4fb1-90d8-48f1aeac53ac","timestamp":"2026-10-30T04:39:42.115Z","effort":"medium","perTurnEffort":"medium","userType":"external","entrypoint":"sdk-cli","cwd":"/Users/simon-pierreboucher/wp29/runs/RC0127","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","version":"2.1.314","gitBranch":"HEAD"}69{"type":"last-prompt","lastPrompt":"Begin","leafUuid":"53d5f296-5de9-4fb1-90d8-48f1aeac53ac","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4"}70{"type":"atis-latch","atis":"","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4"}71{"parentUuid":"53d5f296-5de9-4fb1-90d8-48f1aeac53ac","isSidechain":false,"promptId":"a3bfe923-1b21-4947-b786-8dd22198b40e","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01VinAgpaY7jB9WpmvHmR7LQ","type":"tool_result","content":"PGAR GATE pgar_gate/1.0 — PASSED (0 of 35 checks failed)\nreceipt: /Users/simon-pierreboucher/wp29/runs/RC0127/out/state/gate_receipts/20261030T043942.273060Z.json","is_error":false}]},"uuid":"9ce323ef-d7ca-4109-9019-78717a471d63","timestamp":"2026-10-30T04:39:42.281Z","toolUseResult":{"stdout":"PGAR GATE pgar_gate/1.0 — PASSED (0 of 35 checks failed)\nreceipt: /Users/simon-pierreboucher/wp29/runs/RC0127/out/state/gate_receipts/20261030T043942.273060Z.json","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sandboxed":false,"sourceToolAssistantUUID":"53d5f296-5de9-4fb1-90d8-48f1aeac53ac","permissionDecision":{"decision":"accept","source":"config","reasonType":"rule","ruleSource":"cliArg"},"userType":"external","entrypoint":"sdk-cli","cwd":"/Users/simon-pierreboucher/wp29/runs/RC0127","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","version":"2.1.314","gitBranch":"HEAD"}72{"type":"api-request-blob","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","hash":"086b55ef0f12876d7592df521dc6b33f53d5d4c9b0ac769d66c9a961cf35e5b3","message":{"role":"assistant","content":[{"type":"thinking","thinking":"","signature":"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"},{"type":"text","text":"Gate failures at this point are only the P5 deliverables; the P4 contract and reproducibility checks pass. Now the report and claims."},{"type":"tool_use","id":"toolu_01VinAgpaY7jB9WpmvHmR7LQ","name":"Bash","input":{"command":"cat > out/report.md <<'EOF'\n# F5-conf-04 — VFI vs closed-form policy, optimal growth with log utility\n\n## Question\nA planner maximises Σ β^t ln c_t subject to y_{t+1} = (y_t − c_t)^α (Cobb–Douglas, full depreciation, productivity 1). We compare the closed-form solution of V(y) = max_{0<c<y} {ln c + β V((y−c)^α)} with value-function iteration (VFI) on the prescribed grid, at y = 0.5, 1, 2, and at V(1).\n\n## Data and exclusions\nOnly `data/model.csv` (10 parameter rows, `n_input_rows`) is used: α = 0.36, β = 0.95, a grid of 400 points equally spaced in ln y on [0.05, 5] (`grid_points_used`, `n_analysed`), VFI tolerance 1e-8, evaluation points 0.5, 1.0, 2.0. Nothing was excluded (`out/exclusions.csv`, 10 → 10). The SHA-256 matches the bundle manifest (`out/state/data_audit.md`). None of the evaluation points is a grid node; see `data_issues`.\n\n## Method\n**Closed form (guess and verify).** Guess V(y) = A + B ln y. The right-hand side is ln c + β(A + Bα ln(y−c)). The first-order condition 1/c = αβB/(y−c) gives c = y/(1+αβB). Matching the ln y coefficients gives B = 1 + αβB, so B = 1/(1−αβ). Then c(y) = (1−αβ) y and the savings rate is (y−c)/y = αβ. Matching the constants gives A = [ln(1−αβ) + (αβ/(1−αβ)) ln(αβ)]/(1−β). With these parameters, B = 1.5198 (`diag_closed_form_B`) and A = −19.5244 (`diag_closed_form_A`). This rests on four assumptions: log utility; Cobb–Douglas technology y' = k^α with 0<α<1; full depreciation, with productivity normalised to 1; and an interior solution (0 < c < y, guaranteed because ln c → −∞ at c→0 and ln(y−c) → −∞ at c→y). Both functions are concave, so the first-order condition is sufficient. As a numerical check, brute-force maximisation of the Bellman right-hand side at y = 1 recovers V(1) and c = 0.658 to about 1e-13 (`out/state/checks.md`, item 2).\n\n**Contraction.** The Bellman operator T is monotone, and it discounts: T(V + a) = TV + βa. By Blackwell's sufficient conditions it is therefore a contraction in the sup norm with modulus β = 0.95 (`contraction_modulus`). One caveat: ln is unbounded, so on all of (0, ∞) the argument needs a weighted norm. On the compact grid used here, every per-period utility is finite and the bounded-function argument applies directly.\n\n**VFI.** We use discrete-choice VFI on the prescribed grid. For each grid point y_i, the choice is next-period output y'_j on the same grid, with consumption c_ij = y_i − (y'_j)^{1/α}. Infeasible pairs (c ≤ 0) get −∞. Iteration starts at V_0 = 0 and stops when ‖V_{n+1} − V_n‖_∞ < 1e-8. The closed form is never used inside the VFI. The policy c(y_i) comes from the argmax. Values at the off-grid evaluation points are linear interpolations in ln y between neighbouring nodes. No randomness is involved (`random_seed` = null).\n\n## Results\n| y | closed form c | VFI c |\n|---|---|---|\n| 0.5 | 0.329 (`c_closed_y05`) | 0.32882 (`c_num_y05`) |\n| 1.0 | 0.658 (`c_closed_y1`) | 0.65899 (`c_num_y1`) |\n| 2.0 | 1.316 (`c_closed_y2`) | 1.30963 (`c_num_y2`) |\n\n- The largest absolute policy discrepancy across the three points is 0.00637 (`max_abs_error_policy`), at y = 2. That is about 0.5% of consumption.\n- V(1) is −19.52441 from the closed form (`value_closed_y1`) and −19.52476 from VFI (`value_num_y1`), a gap of −3.4e-4 utils (`diag_value_error_y1`).\n- The closed-form savings rate is αβ = 0.342 (`savings_rate_closed_form`). This is the baseline.\n- VFI met the stopping rule after 361 iterations (`n_iterations`), with a final sup change of 9.997e-9 (`final_sup_change`). Status is `feasibility` = \"complete\".\n\n## Uncertainty\nThe model is deterministic, so there is no sampling uncertainty. The numerical error has two parts.\n1. **Iteration error.** It is bounded by β/(1−β)·‖V_n − V_{n−1}‖ = 1.9e-7 utils (`diag_vfi_error_bound_beta_over_1mbeta_times_final_change`). This is negligible.\n2. **Discretisation and interpolation error.** This part dominates. It depends on the log grid step of 0.01154 (`diag_grid_log_step`). Because y' is restricted to grid nodes, the implied capital k = y'^{1/α} moves in relative steps of about 0.0115/α ≈ 3.2%. The policy is therefore a step function, and its error is of the order of the grid spacing. Over all 400 nodes, the maximum policy error is 0.0251 (`diag_max_abs_policy_error_on_grid`), largest at high y, where absolute steps are bigger. The maximum value error is 4.8e-4 utils (`diag_max_abs_value_error_on_grid`).\n\nThe value function converges much more tightly than the policy. This is expected, because the objective is flat near its optimum.\n\n## Limitations and open issues\n- **Scope.** The validation covers a single parameter point (α = 0.36, β = 0.95), one grid (400 log-spaced points on [0.05, 5]) and one tolerance. It does not show accuracy for other parameters, grids, or for models without a closed form, such as partial depreciation or CRRA utility other than log.\n- **Grid truncation.** The bounds were checked: the optimal y' never hits a grid bound (`diag_policy_hits_lower_bound` = `diag_policy_hits_upper_bound` = 0).\n- **Off-grid evaluation.** The evaluation points 0.5, 1, 2 are not grid nodes, so the VFI numbers include interpolation error on top of the discrete-choice error (recorded in `data_issues`). A continuous-choice VFI would reduce the policy error. We did not use one, to stay within the prescribed design.\n- The discrete-choice formulation is a modelling choice made within the prescribed design, not a change to it. It is documented in `data_issues`.\nEOF\ncat > out/claims.json <<'EOF'\n[\n{\"id\":\"C1\",\"text\":\"The closed-form policy is c(y)=(1-alpha*beta)y, giving 0.329, 0.658, 1.316 at y=0.5,1,2, with a savings rate of alpha*beta=0.342.\",\"results_keys\":[\"c_closed_y05\",\"c_closed_y1\",\"c_closed_y2\",\"savings_rate_closed_form\"],\"status\":\"supported\",\"caveat\":\"Requires log utility, Cobb-Douglas technology, full depreciation and an interior solution.\"},\n{\"id\":\"C2\",\"text\":\"Discrete-choice VFI on the prescribed 400-point log grid reproduces the closed-form policy at the three evaluation points within 0.0064 (about 0.5% of consumption).\",\"results_keys\":[\"c_num_y05\",\"c_num_y1\",\"c_num_y2\",\"max_abs_error_policy\",\"grid_points_used\"],\"status\":\"supported\",\"caveat\":\"Error is mostly discretisation plus log-linear interpolation; it holds for this grid and parameter point only.\"},\n{\"id\":\"C3\",\"text\":\"The VFI value at y=1 matches the closed-form V(1)=-19.5244 to within about 3.4e-4 utils.\",\"results_keys\":[\"value_closed_y1\",\"value_num_y1\",\"diag_value_error_y1\"],\"status\":\"supported\",\"caveat\":\"Interpolated in ln y; y=1 is not a grid node.\"},\n{\"id\":\"C4\",\"text\":\"The Bellman operator is a sup-norm contraction with modulus beta=0.95, and VFI met the 1e-8 stopping rule in 361 iterations, so the iteration error is bounded by about 1.9e-7 utils.\",\"results_keys\":[\"contraction_modulus\",\"n_iterations\",\"final_sup_change\",\"diag_vfi_error_bound_beta_over_1mbeta_times_final_change\"],\"status\":\"supported\",\"caveat\":\"The contraction argument uses bounded utility on the compact grid; on the full domain, log utility needs a weighted norm.\"},\n{\"id\":\"C5\",\"text\":\"Discretisation, not iteration, dominates the numerical error: the maximum policy error over all grid nodes is 0.025 and grows with y.\",\"results_keys\":[\"diag_max_abs_policy_error_on_grid\",\"diag_grid_log_step\",\"final_sup_change\"],\"status\":\"supported\",\"caveat\":\"The claim that the error grows with y comes from the step-function structure; only the maximum is stored in the results.\"}\n]\nEOF\n~/wp29/venv/bin/python - <<'EOF'\nimport json\np=json.load(open('out/state/phases.json'))\np['P4']['status']='passed'; p['P4']['checks'].append('gate run 20261030T043909.783399Z: contract keys+reproducibility ok; failures only P5 deliverables (report/claims/ledger) not yet written')\np['P4']['notes']='receipt out/state/gate_receipts/20261030T043909.783399Z.json'\np['P5']['status']='passed'; p['P5']['checks']=['report.md with 6 sections, key citations','claims.json 5 claims referencing existing keys','final gate run (see notes)']\njson.dump(p,open('out/state/phases.json','w'),indent=1)\nEOF\necho \"- 2026-10-30 P4 passed (gate receipt 20261030T043909). 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task is finished: the numerical solution matches the closed form closely, all phases P0–P5 are marked passed, and the final gate run passed 35 of 35 checks.\n\n**Closed form.** I derived it by guessing V(y) = A + B ln y and checking it against the Bellman equation:\n- **Policy:** c(y) = (1−αβ)y, so consumption is 0.329, 0.658 and 1.316 at y = 0.5, 1 and 2.\n- **Savings rate:** αβ = 0.342.\n- **Value:** B = 1/(1−αβ) and A = [ln(1−αβ) + αβ/(1−αβ)·ln(αβ)]/(1−β), giving V(1) = −19.5244.\n- **Check:** maximising the right-hand side of the Bellman equation by brute force at y = 1 recovers the same V(1) and c = 0.658.\n\n**Numerical solution.** I iterated the value function on the prescribed grid (400 points equally spaced in ln y on [0.05, 5]), choosing next period's output from the same grid points. It reached the 1e-8 stopping rule in 361 iterations.\n- **Policy:** VFI gives 0.3288, 0.6590 and 1.3096 at the three points. The largest gap from the closed form is 0.0064, at y = 2, about 0.5% of consumption.\n- **Value:** VFI gives V(1) = −19.52476, about 3.4e-4 below the closed form.\n- **Contraction modulus:** β = 0.95, by Blackwell's sufficient conditions. Because log utility is unbounded, this argument applies directly only on the compact grid; the full domain would need a weighted norm.\n\n**Where the error comes from.** Almost all of it comes from the grid, not from stopping the iteration early. The iteration error is bounded by about 1.9e-7. The largest policy error across all grid points is 0.025, at high y, because next period's output can only take grid values.\n\n**Limitations:**\n- The check covers one parameter point (α = 0.36, β = 0.95) and one grid only.\n- None of the three evaluation points is a grid point, so the VFI numbers are interpolated linearly in ln y between neighbouring points. That adds some error on top of the grid error. This and the choice of method are recorded under `data_issues`.\n- A method that lets consumption vary continuously would reduce the policy error. I didn't use one, to stay within the prescribed design.\n\nRunning the script twice from scratch gave byte-identical results, and it uses no random numbers.\n\nFiles are in `out/`:\n- `results.json`\n- `report.md`\n- `analysis.py`\n- `claims.json` (5 claims)\n- `exclusions.csv`\n- `state/` (working records and gate receipts)"}],"container":null,"stop_reason":"end_turn","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":319,"cache_read_input_tokens":23096,"output_tokens":935,"output_tokens_details":{"thinking_tokens":22},"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":319},"inference_geo":"global","iterations":[],"speed":"standard","fallback_credit":null},"input_transformations":[],"diagnostics":null,"context_management":null},"apiBlockIndex":1,"requestId":"req_011CgXog56DisdNDpA6smtGJ","requestRef":"baaac139-1dd1-451d-a66d-1b8a1f943c76","requestedModel":"claude-opus-5-5","type":"assistant","uuid":"705d05c2-5acf-4728-8ebd-5795226d79ff","timestamp":"2026-10-30T04:39:55.551Z","effort":"medium","perTurnEffort":"medium","userType":"external","entrypoint":"sdk-cli","cwd":"/Users/simon-pierreboucher/wp29/runs/RC0127","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","version":"2.1.314","gitBranch":"HEAD"}80{"type":"last-prompt","lastPrompt":"Begin","leafUuid":"705d05c2-5acf-4728-8ebd-5795226d79ff","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4"}81{"type":"cost-state","sessionId":"98721500-2ff2-445a-92ba-0f827c4c6ea4","totalCostUSD":0.4394302,"totalAPIDuration":136509,"totalAPIDurationWithoutRetries":136502,"totalToolDuration":805,"totalLinesAdded":0,"totalLinesRemoved":0,"totalDuration":137467,"startTime":1793335058091,"modelUsage":{"claude-opus-5-5":{"inputTokens":28,"outputTokens":14942,"thinkingTokens":1408,"cacheReadInputTokens":154616,"cacheCreationInputTokens":21911,"cacheCreationEphemeral5mInputTokens":21911,"cacheCreationEphemeral1hInputTokens":0,"webSearchRequests":0,"costUSD":0.4394302}},"hasUnknownModelCost":false}82