Closes the test-coverage warning that the smart-HTTP push ingest path was
unexercised. Adds 5 cases: receive-pack streams BEFORE the Docmost cycle; a
held lock throws GitSyncLockHeldError and runs neither the receive-pack nor the
cycle; a post-push cycle error is swallowed (the push is durable, poll retries)
while the lock is still released; a missing service user runs the receive-pack
but skips the immediate cycle; and a globally-disabled git-sync refuses without
touching the lock.
(The 503/Retry-After mapping in git-http.service is the sibling warning; its spec
is in the repo's pre-existing set of jest suites that can't load locally via the
react-dom/tiptap transform chain, so that case is left for CI.)
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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