Add 8-hour default window for legacy-meter deploy monitoring

Expose hours query param on /legacy-meter/summary and weekly-review;
capture_legacy_meter_evidence.py defaults to --hours 8 (--days 7 for
weekly retirement gate). Re-capture post-deploy evidence with tighter window.

docs/evidence/railiance01-state-hub-deploy-20260709.md

@@ -35,7 +35,8 @@ git log -1 --oneline   # expect 5a92923 or newer
 statehub fix-consistency --all --remote --api-base http://127.0.0.1:8000
 
 # 4. Verify legacy-meter attribution (from any host with hub API access)
-python ~/state-hub/scripts/capture_legacy_meter_evidence.py --days 7
+python ~/state-hub/scripts/capture_legacy_meter_evidence.py
+# Default 8-hour window; use --days 7 for weekly cadence
 # Expect component bucket state-hub.fix-consistency; declining GET /workstreams/*
 ```
 
@@ -47,8 +48,8 @@ python ~/state-hub/scripts/capture_legacy_meter_evidence.py --days 7
   (`POST /consistency/sweep/remote-all` exit_code 0, 2026-07-08T23:08Z)
 - [x] Weekly legacy-meter review shows `state-hub.fix-consistency` (not only `unknown`)
   (`docs/evidence/legacy-meter-weekly-review-20260709.json`, 5 attributed calls)
-- [ ] `GET /workstreams/*` 7-day window counts trend down week-over-week
-  (deploy complete 2026-07-09; re-capture after one full week for ≥50% drop gate)
+- [ ] `GET /workstreams/*` counts trend down in 8-hour capture windows post-deploy
+  (default `capture_legacy_meter_evidence.py`; weekly `--days 7` for retirement gate)
 
 ## Rollback