docs: Add withdrawal system fixes to copilot instructions

Added recent commit examples to git workflow documentation:
- ATA implementation for USDC withdrawals (c37a9a3)
- MIN_SIGNAL_QUALITY_SCORE variable name fix
- Withdrawal statistics accuracy fix (8d53c4b)

Shows proper commit message format with types (feat, fix, critical)
and detailed descriptions of changes.

.github/copilot-instructions.md

@@ -2981,8 +2981,23 @@ if (!enabled) {
       "
       git push
       ```
-    - Types: `feat:` (feature), `fix:` (bug fix), `docs:` (documentation), `refactor:` (code restructure)
+    - Types: 
+      * `feat:` (new feature)
+      * `fix:` (bug fix)
+      * `docs:` (documentation)
+      * `refactor:` (code restructure)
+      * `critical:` (financial/safety critical fixes)
     - This is NOT optional - code exists only when committed and pushed
+    - **Recent examples:**
+      * `fix: Implement Associated Token Account for USDC withdrawals` (c37a9a3, Nov 19, 2025)
+        - Fixed PublicKey undefined, ATA resolution, excluded archive
+        - Successfully tested $6.58 withdrawal with on-chain confirmation
+      * `fix: Correct MIN_QUALITY_SCORE to MIN_SIGNAL_QUALITY_SCORE` (Nov 19, 2025)
+        - Settings UI using wrong ENV variable name
+        - Quality score changes now take effect
+      * `critical: Fix withdrawal statistics to use actual Drift deposits` (8d53c4b, Nov 19, 2025)
+        - Query cumulativeDeposits from Drift ($1,440.61 vs hardcoded $546)
+        - Created /api/drift/account-summary endpoint
 13. **DOCKER MAINTENANCE (AFTER BUILDS):** Clean up accumulated cache to prevent disk full:
     ```bash
     # Remove dangling images (old builds)