docs: Document n8n symbol normalization architecture and FARTCOIN fix

- Discovered that n8n normalizes symbols BEFORE sending to bot
- Bot normalization code is never used (symbols already in *-PERP format)
- Adding new symbols requires updating n8n workflow, not bot code
- FARTCOIN fix applied to workflows/trading/parse_signal_enhanced.json
- User must import updated workflow to n8n for FARTCOIN to work

.github/copilot-instructions.md

@@ -2502,8 +2502,24 @@ TradingView alert → n8n Parse Signal Enhanced (extracts metrics + timeframe +
   ↓ positionManager.addTrade() [ONLY after DB save succeeds - prevents unprotected positions]
 ```
 
-**n8n Parse Signal Enhanced Workflow (Nov 27, 2025):**
+**n8n Parse Signal Enhanced Workflow (Nov 27, 2025 - Updated Dec 7, 2025):**
 - **File:** `workflows/trading/parse_signal_enhanced.json`
+- **CRITICAL: Symbol Normalization Happens HERE (Dec 7, 2025 discovery):**
+  - TradingView sends raw symbol (SOLUSDT, FARTCOIN, etc.)
+  - n8n extracts symbol from message body and normalizes to Drift format (*-PERP)
+  - Bot receives ALREADY NORMALIZED symbols (SOL-PERP, FARTCOIN-PERP)
+  - **Bot normalization code is NOT used** - n8n does it first
+  - **To add new symbols:** Update n8n workflow regex + mapping logic, then import to n8n
+- **Symbol Extraction Regex (Dec 7, 2025):**
+  ```javascript
+  const symbolMatch = body.match(/\b(FARTCOIN|FART|SOL|BTC|ETH)\b/i);
+  // CRITICAL: FARTCOIN checked BEFORE SOL (substring match issue)
+  if (matched === 'FARTCOIN' || matched === 'FART') {
+    symbol = 'FARTCOIN-PERP';
+  } else {
+    symbol = matched + '-PERP';  // SOL → SOL-PERP, BTC → BTC-PERP, etc.
+  }
+  ```
 - **Extracts from TradingView alerts:**
   - Standard metrics: symbol, direction, timeframe, ATR, ADX, RSI, VOL, POS, MAGAP, signalPrice, indicatorVersion
   - **MA Crossover Detection (NEW):** `isMACrossover`, `isDeathCross`, `isGoldenCross` flags