Bot review on PR #187 caught:
1. cadastre_jobs has no extra_config column → Fix H crashed on KeyError
2. Missing tests for Fix H + Fix I
3. _parse_nspd_date didn't validate date ranges
Changes:
- Pivot Fix H: read skip_fresh_hours from raw_targets JSONB (existing column),
no schema migration needed
- _parse_nspd_date: validate via date.fromisoformat() — rejects 2023-13-45
- Add 3 tests for Fix H in backend/tests/workers/test_scrape_cadastre.py
- Add 2 tests for Fix I heartbeat callbacks in test_cadastre_bulk.py
- Add 1 test for parse_nspd_date range validation (was: only format)
49 tests passing.