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

.env.example

@@ -0,0 +1,34 @@
+# Investor Flow — Environment Variables
+# Copy this file to .env and fill in the values.
+
+# ─── Security ───────────────────────────────────────────────────────────────
+# Session secret for JWT signing (generate with: openssl rand -hex 32)
+IFLOW_SESSION_SECRET=dev-secret-change-me
+
+# ─── SEC EDGAR ──────────────────────────────────────────────────────────────
+# Operator email for EDGAR user-agent (required by SEC fair-use policy)
+SEC_OPERATOR_EMAIL=operator@example.com
+
+# ─── X/Twitter ──────────────────────────────────────────────────────────────
+# Cookie string from x.com (for cookie-based scraping)
+X_COOKIE=
+
+# ─── Reddit API ─────────────────────────────────────────────────────────────
+# Reddit OAuth app credentials (https://www.reddit.com/prefs/apps)
+REDDIT_CLIENT_ID=
+REDDIT_CLIENT_SECRET=
+REDDIT_USER_AGENT=investor-flow/1.0
+
+# ─── LLM Provider (ADR-0006: local-only) ────────────────────────────────────
+# URL for the local LLM provider (e.g. LM Studio, ollama, omlx)
+LLM_PROVIDER_URL=http://localhost:1234/v1
+
+# ─── FRED (Federal Reserve Economic Data) ───────────────────────────────────
+# API key from https://fred.stlouisfed.org/docs/api/api_key.html
+FRED_API_KEY=
+
+# ─── OAuth (optional) ───────────────────────────────────────────────────────
+GITHUB_CLIENT_ID=
+GITHUB_CLIENT_SECRET=
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=