chore: add ty + pre-commit hook and repeal even more ruff rules (#9504)

* auto fixes

* auto fix pt2 and transitive deps and undefined var checking locals()

* manual fixes (ignored or letta-code fixed)

* fix circular import

* remove all ignores, add FastAPI rules and Ruff rules

* add ty and precommit

* ruff stuff

* ty check fixes

* ty check fixes pt 2

* error on invalid

sandbox/modal_executor.py

@@ -225,7 +225,7 @@ def setup_signal_handlers():
         # Enable fault handler with file output
         try:
             faulthandler.enable(file=sys.stderr, all_threads=True)
-        except:
+        except Exception:
             pass  # Faulthandler might not be available
 
         # Set resource limits to prevent runaway processes
@@ -234,7 +234,7 @@ def setup_signal_handlers():
             resource.setrlimit(resource.RLIMIT_AS, (1024 * 1024 * 1024, 1024 * 1024 * 1024))
             # Limit stack size to 8MB (default is often unlimited)
             resource.setrlimit(resource.RLIMIT_STACK, (8 * 1024 * 1024, 8 * 1024 * 1024))
-        except:
+        except Exception:
             pass  # Resource limits might not be available
 
         # Set environment variables