docs: update test solutions and mistake logs

- Add new test error solutions to solutions_learned.jsonl
- Document test failures for reflexion pattern testing
- Track database connection and unknown test errors

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

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

docs/mistakes/unknown-2025-11-14.md

@@ -0,0 +1,44 @@
+# Mistake Record: unknown
+
+**Date**: 2025-11-14
+**Error Type**: FileNotFoundError
+
+---
+
+## ❌ What Happened
+
+config.json not found
+
+```
+No traceback
+```
+
+---
+
+## 🔍 Root Cause
+
+Not analyzed
+
+---
+
+## 🤔 Why Missed
+
+Not analyzed
+
+---
+
+## ✅ Fix Applied
+
+Create config.json in project root
+
+---
+
+## 🛡️ Prevention Checklist
+
+Not documented
+
+---
+
+## 💡 Lesson Learned
+
+Not documented