Fix CI lint failure by formatting PR governance scripts (#933)

`CI / lint (pull_request)` failed because `ruff format --check` detected
formatting drift in the new PR governance script and its tests. This PR
aligns those files with repository formatting rules so the lint job can
pass.

- **Root cause**
  - `ruff format --check .` reported two files as non-canonical:
    - `scripts/pr-governance.py`
    - `scripts/tests/test_pr_governance.py`

- **Change set**
  - Applied `ruff` formatting to only the two flagged files.
- No behavioral or logic changes; edits are line-wrap/format
normalization only.

- **Representative update**
  ```python
  parser.add_argument(
"--event", type=Path, required=True, help="Path to the GitHub event
payload JSON."
  )
  ```

---------

Co-authored-by: JerrettDavis <mxjerrett@gmail.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

scripts/tests/test_pr_governance.py

@@ -0,0 +1,163 @@
+"""Tests for pr-governance.py."""
+
+from __future__ import annotations
+
+import importlib.util
+import sys
+from pathlib import Path
+
+
+def _load_module():
+    script = Path(__file__).parent.parent / "pr-governance.py"
+    spec = importlib.util.spec_from_file_location("pr_governance", script)
+    assert spec is not None
+    assert spec.loader is not None
+    module = importlib.util.module_from_spec(spec)
+    sys.modules[spec.name] = module
+    spec.loader.exec_module(module)
+    return module
+
+
+def _event(body: str, *, draft: bool = False, login: str = "octocat") -> dict[str, object]:
+    return {
+        "pull_request": {
+            "number": 42,
+            "draft": draft,
+            "body": body,
+            "user": {"login": login},
+        }
+    }
+
+
+VALID_BODY = """## Description
+
+Add a required PR-governance gate for template validation and review readiness.
+
+Closes #123
+
+## Type of Change
+
+- [x] New feature (non-breaking change that adds functionality)
+- [ ] Documentation update
+
+## Changes Made
+
+- Added a workflow-backed PR template validator.
+- Added local commit message linting in the commit-msg hook.
+
+## Testing
+
+- [x] Unit tests pass (`pytest`)
+- [x] Manual testing performed
+
+### Test Output
+
+```text
+pytest scripts/tests/test_pr_governance.py -q
+```
+
+## Real Behavior Proof
+
+- Environment: Ubuntu runner, Python 3.12
+- Exact command / steps: Open a PR, remove the ready checkbox, re-run the workflow.
+- Observed result: The governance check fails and the PR gets a needs-author-action label.
+- Not tested: Automatic Copilot review rulesets in repository settings.
+
+## Review Readiness
+
+- [x] I have performed a self-review
+- [x] This PR is ready for human review
+
+## Additional Notes
+
+- Maintainers can optionally enable Copilot code review from repository rulesets.
+"""
+
+
+def test_validate_pull_request_marks_ready_pr_valid() -> None:
+    module = _load_module()
+
+    report = module.validate_pull_request(_event(VALID_BODY))
+
+    assert report.valid is True
+    assert report.ready_for_review is True
+    assert report.needs_author_action is False
+    assert report.problems == []
+    assert report.labels_to_add == [module.READY_LABEL]
+    assert module.AUTHOR_ACTION_LABEL in report.labels_to_remove
+
+
+def test_validate_pull_request_allows_draft_without_ready_checkboxes() -> None:
+    module = _load_module()
+    body = VALID_BODY.replace(
+        "- [x] I have performed a self-review", "- [ ] I have performed a self-review"
+    )
+    body = body.replace(
+        "- [x] This PR is ready for human review",
+        "- [ ] This PR is ready for human review",
+    )
+
+    report = module.validate_pull_request(_event(body, draft=True))
+
+    assert report.valid is True
+    assert report.ready_for_review is False
+    assert report.needs_author_action is False
+    assert report.labels_to_add == []
+    assert module.READY_LABEL in report.labels_to_remove
+
+
+def test_validate_pull_request_fails_on_missing_required_content() -> None:
+    module = _load_module()
+    body = """## Description
+
+Fixes #123
+
+## Type of Change
+
+- [ ] New feature (non-breaking change that adds functionality)
+
+## Changes Made
+
+- Change 1
+
+## Testing
+
+### Test Output
+
+```text
+# Paste relevant command output or artifact links here
+```
+
+## Real Behavior Proof
+
+- Environment:
+- Exact command / steps:
+- Observed result:
+- Not tested:
+
+## Review Readiness
+
+- [ ] I have performed a self-review
+- [ ] This PR is ready for human review
+"""
+
+    report = module.validate_pull_request(_event(body))
+
+    assert report.valid is False
+    assert report.needs_author_action is True
+    assert module.AUTHOR_ACTION_LABEL in report.labels_to_add
+    assert any("Description" in problem for problem in report.problems)
+    assert any("Type of Change" in problem for problem in report.problems)
+    assert any("Test Output" in problem for problem in report.problems)
+    assert any("Real Behavior Proof" in problem for problem in report.problems)
+
+
+def test_validate_pull_request_skips_bot_authored_prs() -> None:
+    module = _load_module()
+
+    report = module.validate_pull_request(_event("", login="dependabot[bot]"))
+
+    assert report.valid is True
+    assert report.is_bot_pr is True
+    assert report.needs_author_action is False
+    assert report.labels_to_add == []