IBKR × Kalshi daily-BTC scanner (local-only)

- arb/ibkr.py: Client Portal Gateway client (localhost:5000 over self-
  signed SSL; auth_status, tickle, snapshot, secdef/search). Distinct
  NotConnected vs NotAuthed exceptions for graceful UI fallbacks.
- arb/daily.py: pairs each user-configured IBKR ForecastEx daily-BTC
  contract against the Kalshi KXBTCD market closing at the same UTC
  instant with nearest strike. Reuses arb.calc.evaluate for the worst-
  case arb math; IBKR slots into the 'pq' position. NO KALSHI status
  when no matching Kalshi market exists.
- data/ibkr_contracts.example.json: template (real file gitignored).
- /api/scan/daily route + 'IBKR × Kalshi' tab in the local UI. Tab
  shows a setup banner explaining what to do when Gateway/contracts
  aren't configured (vs crashing).
- Public Pages dashboard unchanged (positions + IBKR are local-only).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.gitignore

@@ -1,6 +1,9 @@
 # Secrets — never commit. Provide your own data/secrets.json locally.
 data/secrets.json
 
+# IBKR contract watchlist (user-editable; conids/dates change frequently)
+data/ibkr_contracts.json
+
 # Python
 __pycache__/
 *.pyc