124f5a45a2
mcp had its OWN drifted copy of the converter (markdown-converter.ts ~900 lines, docmost-schema.ts ~1270 lines, markdown-document.ts) — older than the shared package, missing the git-sync fixes AND the #293 canon. This switches mcp's converter CORE to @docmost/prosemirror-markdown, so mcp jumps straight to the canonical format and the drift-generating second copy is gone. - markdown-converter.ts / markdown-document.ts / docmost-schema.ts become thin re-export shims of the package (convertProseMirrorToMarkdown, the docmost:meta envelope, docmostExtensions + docmostSchema=getSchema(docmostExtensions)). The mcp-only helpers clampCalloutType/sanitizeCssColor are preserved verbatim in the schema shim (the package doesn't expose them via its barrel). ~2170 lines of the drifted converter/schema bodies deleted. - collaboration.ts drops its own ~360-line marked pipeline (preprocessCallouts, bridgeTaskLists, extractFootnotes, the footnoteRef extension) and re-points to the package's markdownToProseMirror, keeping markdownToProseMirrorCanonical and all the yjs/collab write glue. footnote-lex/analyze doc comments updated (they now describe advisory legacy-syntax diagnostics, not an importer). Schema parity verified: the package schema is a strict SUPERSET of mcp's old schema — every node and attr mcp declared is present (the package only adds status/pageEmbed/transclusion*/subpages.recursive/etc.), so nothing is silently dropped on the switch. The switch actually FIXES two pre-existing mcp data-loss bugs its own tests documented: htmlEmbed and pageBreak now round-trip (were dropped by the old mcp converter). Footnotes: the package assembles inline ^[body] footnotes on import (sequential fn-N ids, identical bodies merged), so mcp's canonicalizeFootnotes is now an idempotent no-op after it (verified). Legacy reference footnotes [^id]/[^id]: are inert literal text (canon #2 no-backward-compat) — lossless, the text survives verbatim. Build hygiene: packages/mcp/build/ is now gitignored and untracked, matching the git-sync/prosemirror-markdown convention (private package, rebuilt in CI/Docker, so src and prod can never silently diverge). This also removes a dead untracked build/_vendored_editor_ext/ artifact that a broad `git add` would otherwise commit. Dependency: packages/mcp/package.json gains @docmost/prosemirror-markdown (workspace:*); pnpm-lock.yaml gets the matching link importer (mirrors git-sync). mcp tests updated deliberately to the canonical forms (highlight ==, math $…$, image <!--img-->, drawio/media discriminators, subpages/pageBreak comments, textAlign, inline ^[…] footnotes) with strict assertions; 4 structural safety-net round-trip tests added. mcp: node --test 454 passed; tsc clean. package: 657 passed. git-sync: 268 passed. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>