A REST/MCP/agent rename (no live editor) wrote the new title to the
page.title column, then writePageTitle loaded the ydoc (fragment still
OLD) and set it to NEW only in memory. On disconnect onStoreDocument saw
titleText(NEW) === column(NEW), took the no-op fast-path, and never
persisted the in-memory fragment — so page.ydoc kept the OLD title and a
later body edit silently reverted the column back to OLD.
writePageTitle now persists the 'title' fragment to page.ydoc DIRECTLY
(PersistenceExtension.persistTitleFragmentYdoc) after the transact,
bypassing the no-op onStoreDocument. The write carries no treeUpdate, so
the tree WS/redis listeners do not re-broadcast (no double broadcast),
and it is idempotent/lock-free so it is safe whether or not a live editor
is connected. Adds a persist-then-reload-then-edit-body regression test
that fails on the old no-op behaviour and passes after the fix.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
e8805b39c8