perf: only type-check changed packages in pre-commit hook

Use Turborepo's --filter='...[HEAD]' to only type-check packages
with staged changes instead of all 21 packages. This reduces
pre-commit hook time from ~30s to ~3s for single-package changes.

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

Co-Authored-By: Claude <noreply@anthropic.com>

lefthook.yml

@@ -7,7 +7,8 @@ pre-commit:
       stage_fixed: true
 
     type-check:
-      run: pnpm type-check
+      # Only type-check packages with staged changes
+      run: pnpm turbo type-check --filter='...[HEAD]'
 
 pre-push:
   commands: