Only block comments are surfaced by the frontend now. The document-level
and annotation-level comment endpoints and service methods existed but
had no consumer. Remove them along with their repository queries and
test coverage so the surface area matches the actual feature set.
Shared edit, delete, and block reply endpoints stay. postBlockComment
now carries the authorName/mention/audit behaviors previously tested
through the dropped postComment method, so those behaviors remain
covered by the block-scoped test suite.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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