The existing name-level contract (packages/git-sync schema-editor-ext-contract)
only compares node/mark TYPE NAMES, so a new attribute added to an existing node
upstream slips through and is silently dropped on every git-sync round trip -- a
repeatedly-hit data-loss class (image caption #221, paragraph align #10).
This closes the attribute gap by comparing the RESOLVED ProseMirror Schema
objects (getSchema has already merged all addGlobalAttributes spreads into
concrete per-node attrs) of the server's canonical tiptapExtensions vs the
git-sync mirror, asserting equal attribute-key sets per shared node/mark modulo
a committed, self-checking allowlist of the 6 understood divergences. A forgotten
attribute now fails CI loudly instead of losing data. Comparing resolved schemas
(not raw extension configs) is what makes this stable rather than the fragile
config-shape compare the name-level test deferred.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
claude-stand
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