fix: backfill symbol_demand for sidebar-added symbols + analyst ratings schema fix

- Add await ctx.cache.subscribe() to addSymbol mutation so symbols
  added via the sidebar get registered in symbol_demand and yfinance
  jobs are queued immediately
- Backfill PEP, WYNN, STZ, CELH into symbol_demand + adapter_queue
- Upgrade yahoo-finance2 3.15.3 -> 3.15.4 and pass validateResult:false
  to quoteSummary() to handle Yahoo schema drift
- Add error detail logging for analyst ratings schema failures
- Update .gitignore with common ignores

.automaton/loops/investor-flow-drain/.state.loop

@@ -0,0 +1,14 @@
+{
+  "current_task": "options-adapters-and-options-dd-panel-m3",
+  "halt_reason": "verifier_failed",
+  "iteration_count": 0,
+  "last_tick_at": null,
+  "last_verdict": null,
+  "name": "investor-flow-drain",
+  "resumed_count": 0,
+  "schema_version": 1,
+  "score_history": [],
+  "status": "halted",
+  "worktree_branch": null,
+  "worktree_path": null
+}