ci: scope type checking to instructor package only

Changed ty check to only check instructor/ directory instead of the
entire project. This excludes docs/tutorials and docs/hooks which
contain example code and Jupyter notebooks that aren't meant to be
strictly type-checked.

Reduces diagnostics from 6413 to 68 (all in actual codebase).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: jxnl

.github/workflows/pyright.yml

@@ -24,4 +24,4 @@ jobs:
       - name: Install the project
         run: uv sync --all-extras
       - name: Run type check with ty
-        run: uv run ty check
+        run: uv run ty check instructor/