The todo entry said the file-viewer registration was dead; tracing it confirmed that and turned up the
reason it looked alive — the ephemeral file viewer is a different mounting path entirely. Recorded, with
what was checked in the database before deleting anything.
CLAUDE.md, navigation-audit.md and workspace-panels.md all listed FILE_VIEWER_CHANNEL among the
legitimate refresh/signal channels. It never had a publisher, and no longer exists.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>