Three more git-sync QA defects from the 2nd live pass on PR #119, plus a
callout-fidelity nit:
1. SPURIOUS conflict leaked raw markers into canonical main (root cause). On an
ordinary round-trip the only difference between the docmost mirror (normalize-
on-write) and a user's raw push is trailing/empty-line normalization, which made
git's line-based docmost->main merge CONFLICT, and the wedge fix then committed
the file WITH literal <<<<<<< / ======= / >>>>>>> markers onto main (git and the
DB silently diverged for cycles). Fix: on a conflict, normalize trailing/empty
lines on BOTH sides (showStage :2:/:3:) before comparing — a trailing-only diff
is recognized as spurious and resolved to the clean normalized form. A GENUINE
same-block conflict is auto-resolved to OURS (git wins, mirroring the live-doc
3-way rule); the docmost side stays on the `docmost` branch + page history. Raw
markers NEVER reach main again.
2. Concurrent UI<->git edit silently lost the UI side. The git->Docmost 3-way merge
ran against a live Y.Doc that hadn't yet received the user's debounced in-flight
edit, so git clean-applied (no conflict detected) and the edit vanished even on a
different block. Fix: flush the pending debounced store before the merge so the
in-flight edit is drained into the live doc first — a different-block edit is
merged, a same-block one is detected and pinned to history (recoverable).
3. Smart-HTTP HEAD flapped to the read-only `docmost` mirror (~1/4 of clones). The
engine transiently checks out `docmost` mid-pull and the host advertises whatever
HEAD resolves to. Fix: VaultGit.pinHeadToMain(); the cycle restores HEAD->main in
a finally; and the upload-pack ref advertisement is served HEAD-pinned under the
per-space lock so it can never observe a mid-cycle HEAD.
4. (callout) clampCalloutType now mirrors the editor's GITHUB_ALERT_TYPE_MAP for
non-schema aliases (tip->success, caution->danger, important->info) instead of
flatly collapsing to info. The editor schema genuinely supports only the six
banner types, so unknown types still fall back to info (by design).
Tests: deterministic real-git trailing-blank round-trip (no conflict, no markers,
in sync over 2 cycles) + genuine-conflict no-marker-leak; HEAD advertisement
stability; pre/post-flush concurrent-edit survival; serveReadAdvertisement lock
pin; widened callout-alias coverage. Engine vitest + server tsc + collaboration /
git-http / orchestrator specs all green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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