Files with no frontmatter or wiki.publish not set should be silently
ignored rather than failing the whole pipeline run.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Timestamps made the idempotency check always false — every run would
rewrite every page. Commit SHA is stable: same source commit produces
identical wikitext, so unchanged pages are correctly skipped.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>