chore: enable F821, F401, W293 (#9503)

* auto fixes

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

* manual fixes (ignored or letta-code fixed)

* fix circular import

pyproject.toml

@@ -194,11 +194,8 @@ ignore = [
     "E712",  # true-false-comparison
     "E722",  # bare except
     "E721",  # type comparison
-    "F401",  # unused import
-    "F821",  # undefined name
     "F811",  # redefined while unused
     "F841",  # local variable assigned but never used
-    "W293",  # blank line contains whitespace
 ]
 
 [tool.ruff.lint.isort]