fix: serialize context_rules to JSON string if parsed as dict/list to avoid 422 Unprocessable Entity

backend.py

@@ -2008,6 +2008,8 @@ async def execute_build_cycle(project_name: str, goal: str):
         task = json.loads(raw)
         task_prompt = task.get("prompt", "")
         context_rules = task.get("context_rules", "")
+        if isinstance(context_rules, (dict, list)):
+            context_rules = json.dumps(context_rules)
     except Exception as e:
         log_activity(f"[Build Mode Error] Plan JSON parsing failed: {e} | Raw: {raw}")
         return
@@ -2144,6 +2146,8 @@ async def execute_eternity_cycle(project_name: str, goal: str):
         task = json.loads(raw)
         task_prompt = task.get("prompt", "")
         context_rules = task.get("context_rules", "")
+        if isinstance(context_rules, (dict, list)):
+            context_rules = json.dumps(context_rules)
     except Exception as e:
         log_activity(f"[Eternity Mode Error] Plan JSON parsing failed: {e} | Raw: {raw}")
         return