🐛 fix(ci): allow kebab-case commit scopes

The scope regex only accepted [a-z0-9_], rejecting hyphenated scopes
like tsl-syntax that dominate the history (12x vs 4x underscore form).
Align both linter copies and the spec doc to accept lower-kebab-case.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitea/ci/commit_message_lint.py

@@ -78,7 +78,7 @@ def _validate_subject_line(
     m = re.match(
         r"^(?:(?P<emoji>:[a-z0-9_+-]+:)\s+)?"
         r"(?P<type>[a-z]+)"
-        r"(?P<scope>\([a-z0-9_]+\))?"
+        r"(?P<scope>\([a-z0-9_-]+\))?"
         r":\s+(?P<text>.+)$",
         subject,
     )