feat(api): Implement EventManager error logging and add coverage (#29204)

- Ensure `EventManager._notify_layers` logs exceptions instead of silently swallowing them 
  so GraphEngine layer failures surface for debugging
- Introduce unit tests to assert the logger captures the runtime error when collecting events
- Enable the `S110` lint rule to catch `try-except-pass` patterns
- Add proper error logging for existing `try-except-pass` blocks.

api/core/agent/cot_agent_runner.py

@@ -1,4 +1,5 @@
 import json
+import logging
 from abc import ABC, abstractmethod
 from collections.abc import Generator, Mapping, Sequence
 from typing import Any
@@ -23,6 +24,8 @@ from core.tools.entities.tool_entities import ToolInvokeMeta
 from core.tools.tool_engine import ToolEngine
 from models.model import Message
 
+logger = logging.getLogger(__name__)
+
 
 class CotAgentRunner(BaseAgentRunner, ABC):
     _is_first_iteration = True
@@ -400,8 +403,8 @@ class CotAgentRunner(BaseAgentRunner, ABC):
                             action_input=json.loads(message.tool_calls[0].function.arguments),
                         )
                         current_scratchpad.action_str = json.dumps(current_scratchpad.action.to_dict())
-                    except:
-                        pass
+                    except Exception:
+                        logger.exception("Failed to parse tool call from assistant message")
             elif isinstance(message, ToolPromptMessage):
                 if current_scratchpad:
                     assert isinstance(message.content, str)