The PM<->Markdown converter and its lib are duplicated the same way as the
AI-chat tool definitions: a copy lives in packages/mcp/src/lib (without
canonicalize.ts), another in docmost-sync's docmost-client lib (with
canonicalize + the no-comment-threads markdown-document mode), and the
git-sync integration plan vendors a third copy into packages/git-sync.
Record the already-observed drift (collaboration.ts ~329 changed lines,
etc.) and the docmost-schema vs @docmost/editor-ext schema-divergence risk,
and tie it to the existing single-source-of-truth fix direction.
Remove outdated process sections from several backlog markdown files and add new backlog items for AI chat step limits, endpoint status config, and API key field UI improvements.
