Item 3 of the #351 remainder — resolve the two pinned converter
counterexamples, fixtures-first.
orderedList.start (genuine P1 loss): the converter always emitted "1."
and dropped attrs.start. Now the markdown path emits `${start + index}.`
(Number-coerced, guards a stray non-numeric start) and the raw-HTML path
emits `<ol start="N">` when start>1; a default (start=1) list is
byte-unchanged. tiptap StarterKit reads both forms back. Un-pinned as a
passing regression test; orderedList.start is now value-fuzzed.
column.width: the "50% churn" counterexample rested on a false premise —
the canonical editor (editor-ext column.ts) stores width as a unitless
flex-grow NUMBER (parseFloat, `flex:${width}`), never a "%" string, and
docmost-schema.ts is a vendored mirror that MUST match it. The original
parseFloat was correct parity and already byte-stable for numeric widths.
Reverted the mirror to parseFloat, deleted the fabricated counterexample
fixture, and now value-fuzz column.width as a number (real type). No src
behaviour change for column.width — parity with editor-ext preserved.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Create @docmost/prosemirror-markdown — the single framework-free ProseMirror<->
Markdown converter + schema mirror that git-sync and mcp will both consume,
ending the three-hand-synced-copies drift (#293). This step only CREATES the
package (no consumer yet; git-sync untouched); the switch of git-sync and mcp
onto it, plus the canonical format decisions, come in later commits of this PR.
- packages/prosemirror-markdown/src/lib/: the 8 converter-core files copied
VERBATIM from packages/git-sync/src/lib (docmost-schema, markdown-converter,
markdown-to-prosemirror, canonicalize, markdown-document, node-ops, page-file,
index). Confirmed byte-identical — no behavioral drift introduced.
- src/index.ts barrel; package.json (@tiptap/* + jsdom/marked/zod, editor-ext
workspace devDep for the contract test); tsconfig/vitest configs.
- 24 converter-core test files + fixtures copied (engine-coupled layout/
redteam-layout-title tests correctly excluded — they import ../src/engine).
- pnpm-lock importer added; build/ gitignored (CI-built).
Verified (clean checkout, no network): pnpm --frozen-lockfile EXIT 0; tsc EXIT 0;
vitest 23 files, 443 passed | 1 expected-fail (the same image-diagrams
known-limitation carried from git-sync) — faithful extraction. git-sync untouched.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
agent_coder
claude code agent 227