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

.pre-commit-config.yaml

@@ -23,3 +23,10 @@ repos:
       - id: ruff-check
         args: [ --fix ]
       - id: ruff-format
+
+  - repo: local
+    hooks:
+      - id: ty
+        name: ty check
+        entry: uv run ty check .
+        language: python