Review of PR #126 found refreshOwned only replaced a generator-owned line that already existed in a's frontmatter -- it never appended one a didn't have. Every page ingested before this feature shipped has no source_hash line at all, so on its first re-ingest after deploy, the fresh hash was silently dropped: storedSourceHash reads "" forever for that page, the hash never matches, and the skip-on-unchanged feature this whole PR/issue exists to build never engages for the entire pre-existing corpus, permanently, with nothing telling anyone. Fixed by tracking the closing frontmatter fence's position while scanning a's lines, then inserting any generator-owned fields b supplied that a didn't have just before that fence -- sorted for a deterministic, byte-stable result, since map iteration order isn't. Flip-tested: forcing the old drop-silently return turns the new test red; restoring the fix turns it green. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>