The previous legacy fallback at publish.ts treated any state entry without a noteHash as "changed", forcing a full note republish on the first run after upgrading to v0.5.0. That was wasteful: contentHash already detects every local change, so when contentHash matches the file is unchanged and PDS still matches it. Now: if contentHash matches and noteHash is missing, silently backfill noteHash from local content and skip the republish. Also split the "content changed" reason string into "document changed" / "note changed" / "content changed" so the change-detection trigger is visible at a glance.