spb/rent-ka

- realtor_ca: CREA/REALTOR.ca broker rental listings via internal
  PropertySearch_Post API (Scrapfly ASP + residential pool), recursive
  quad-split around the 600-records/area cap, threaded crawl, honest
  failure. ON 20 889, BC 1 281, AB 194, NB/MB/NL/PE tail.
- LiftSystem: probe_liftsystem_gaps.py scans never-probed client_ids
  (1..3200, client name/site read from the feed) -> +15 clients (+146
  listings); fix build_lift_registry.py idempotence bug (coverage sets
  computed before dropping generated entries wiped sources.json to 100)
  + exclude duplicate corporate feeds (Sterling Karamar, Drewlo, Minto).
- Buildium: national discovery campaign -> +71 validated portals (+991
  listings, BC/AB/SK/MB/Atlantic/ON) merged via scripts/merge_candidates.py.
- AppFolio: campaign result = no live ROC portal left (RPM Canada
  decommissioned public portals) — dead ends documented in candidates file.

Site now 83 260 active published listings across 762 sources.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

- LiftSystem API enumerated (1,143 clients probed live) → +593 registered
  (ON 261, AB 150, BC 97, MB 38, SK 26, NS 14, NB 5, NL 1, NU 1)
- New rentfaster connector (open JSON API, 68 non-QC cities, ~23k listings)
- Buildium/AppFolio postal+province scope widened to all Canada ex-QC
- 4 verified Buildium + 1 AppFolio clients added (SK/MB/ON/NS)
- sources.json: 87 → 680 sources ; connectors: 81 → 680

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>