docs: Add session debrief about test fixes and MCP tool lesson

fix_orch.py

@@ -0,0 +1,52 @@
+with open("src/orchestrator_pm.py", "r", encoding="utf-8", newline="") as f:
+    lines = f.readlines()
+
+# Find and replace the JSON parsing section
+new_lines = []
+i = 0
+while i < len(lines):
+    line = lines[i]
+    # Replace the old parsing section
+    if "# 4. Parse JSON Output" in line:
+        # Add new parsing code
+        new_lines.append("   # 4. Parse JSON Output\n")
+        new_lines.append("   try:\n")
+        new_lines.append("    import sys\n")
+        new_lines.append(
+            '    sys.stderr.write(f"[DEBUG] generate_tracks response: {response[:300]}\\n")\n'
+        )
+        new_lines.append("    sys.stderr.flush()\n")
+        new_lines.append("    json_match = response.strip()\n")
+        new_lines.append(
+            '    # Handle mock_gemini_cli.py format: {"type": "message", "content": "[...]"}\n'
+        )
+        new_lines.append('    if \'"content": "\' in json_match:\n')
+        new_lines.append("     import re\n")
+        new_lines.append(
+            '     match = re.search(r\'"content"\\s*:\\s*"(\\[.*?\\])"\', json_match)\n'
+        )
+        new_lines.append("     if match:\n")
+        new_lines.append("      json_match = match.group(1)\n")
+        new_lines.append("    # Handle markdown code blocks\n")
+        new_lines.append('    if "```json" in json_match:\n')
+        new_lines.append(
+            '     json_match = json_match.split("```json")[1].split("```")[0].strip()\n'
+        )
+        new_lines.append('    elif "```" in json_match:\n')
+        new_lines.append(
+            '     json_match = json_match.split("```")[1].split("```")[0].strip()\n'
+        )
+        new_lines.append("    tracks: list[dict[str, Any]] = json.loads(json_match)\n")
+
+        # Skip the old lines
+        i += 1
+        while i < len(lines) and "tracks:" not in lines[i]:
+            i += 1
+    else:
+        new_lines.append(line)
+        i += 1
+
+with open("src/orchestrator_pm.py", "w", encoding="utf-8", newline="") as f:
+    f.writelines(new_lines)
+
+print("Fixed orchestrator_pm.py")