MAINT: Run pre-commit on all files for every event (microsoft#2105)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: romanlutz

.github/workflows/build_and_test.yml

@@ -68,19 +68,15 @@ jobs:
         shell: bash
         run: df -all -h
 
-      - name: Run pre-commit incrementally (on PR)
-        if: github.event_name == 'pull_request'
-        env:
-          RUN_LONG_PRECOMMIT: true
+      - name: Run pre-commit (all files)
+        # Always lint the ENTIRE repository on every event (pull_request,
+        # merge_group, push to main, workflow_dispatch). Running --all-files on
+        # PRs -- rather than only the files changed since origin/main -- ensures
+        # latent violations in untouched files, including the tests/integration,
+        # tests/partner_integration, and tests/end_to_end tiers, are caught before
+        # merge instead of only on the post-merge run against main.
         run: |
           git fetch origin main
-          uv run pre-commit run --from-ref origin/main --to-ref HEAD
-
-      - name: Run pre-commit fully (on main)
-        if: github.ref == 'refs/heads/main'
-        env:
-          RUN_LONG_PRECOMMIT: true
-        run: |
           uv run pre-commit run --all-files
 
   # Main job runs only if pre-commit succeeded