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git-sync's converter-core (src/lib) was a byte-identical duplicate of the new @docmost/prosemirror-markdown package (created in the previous commit). Switch git-sync to consume the package and delete its copy — ending the duplication that the whole #293 effort targets. Pure no-op: NO format/behavior change. - git-sync depends on @docmost/prosemirror-markdown (workspace:*); engine (stabilize/push/pull) + src/index barrel + 12 engine tests re-point their converter imports to the package. - Delete git-sync/src/lib (8 files) and the 23 duplicate converter-core test files + their fixtures — the converter and its ~440 tests now live once, in the package. git-sync keeps only its ENGINE tests, which exercise the converter through the package (the no-op proof). Kept roundtrip-helpers.ts (an engine test imports firstDivergence from it; pure helper, no double-run). - Added docmostExtensions to the package barrel (a kept engine schema-validity test needs it). Verified: editor-ext + prosemirror-markdown + git-sync all tsc EXIT 0; git-sync vitest 28 files, 268 passed, 0 failures (engine cycle/roundtrip/push/ pull/reconcile green = no-op proof); prosemirror-markdown vitest still 443 passed | 1 expected-fail; pnpm --frozen-lockfile EXIT 0; no ../lib refs remain in git-sync. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>