fix: replace bare except clauses with except Exception

Bare `except:` catches BaseException including KeyboardInterrupt and
SystemExit. Replaced 29 instances with `except Exception:`.

agent/tools/ls/ls.py

@@ -94,7 +94,7 @@ class Ls(BaseTool):
                         results.append(entry + '/')
                     else:
                         results.append(entry)
-                except:
+                except Exception:
                     # Skip entries we can't stat
                     continue
             

agent/tools/scheduler/scheduler_service.py

@@ -147,7 +147,7 @@ class SchedulerService:
                     return False
             
             return now >= next_run
-        except:
+        except Exception:
             return False
     
     def _calculate_next_run(self, task: dict, from_time: datetime) -> Optional[datetime]:
@@ -195,7 +195,7 @@ class SchedulerService:
                 # Only return if in the future
                 if run_at > from_time:
                     return run_at
-            except:
+            except Exception:
                 pass
             return None
         

agent/tools/scheduler/scheduler_tool.py

@@ -424,7 +424,7 @@ class SchedulerTool(BaseTool):
             try:
                 dt = datetime.fromisoformat(run_at)
                 return f"一次性 ({dt.strftime('%Y-%m-%d %H:%M')})"
-            except:
+            except Exception:
                 return "一次性"
         
         return "未知"
@@ -438,6 +438,6 @@ class SchedulerTool(BaseTool):
                     return msg.other_user_nickname or "群聊"
                 else:
                     return msg.from_user_nickname or "用户"
-        except:
+        except Exception:
             pass
         return "未知"

agent/tools/scheduler/task_store.py

@@ -72,7 +72,7 @@ class TaskStore:
                         with open(self.store_path, 'r') as src:
                             with open(backup_path, 'w') as dst:
                                 dst.write(src.read())
-                    except:
+                    except Exception:
                         pass
                 
                 # Save tasks