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[Chore] /release-sync v2.2.0 — open and land main→dev sync PR #456

@atlas-apex

Description

@atlas-apex

Driver

/release-sync v2.2.0 (step 9 of the v2.2.0 release flow per #452) — open the main→dev sync PR that makes the v2.2.0 squash commit an ancestor of dev, so the next dev→main release PR only sees genuinely-new commits instead of fighting squash-divergence (v2.0.0 hit 99 conflicts; v2.2.0 itself hit 14).

This is also the first real-world run of PR #451's CHANGELOG carry-forward (step 5b of /release-sync). The skill is now exercised end-to-end against production state.

Scope

  • Branch chore/GH-403-sync-after-v2.2.0 from upstream/dev (done)
  • git merge --no-ff -X ours upstream/main (done — dev wins on conflicts)
  • Step 5b: git checkout upstream/main -- CHANGELOG.md + atomic commit (done — first real-world feat(#448): /release-sync carry forward CHANGELOG.md from main to dev #451 run)
  • Open this sync PR — this ticket exists to track that step
  • Rex review + CEO /approve-merge + merge

Acceptance Criteria

  • Sync PR opens against dev from chore/GH-403-sync-after-v2.2.0
  • After merge: git log upstream/dev..upstream/main --oneline returns empty
  • After merge: dev's CHANGELOG.md top entry is ## [2.2.0] — 2026-05-29
  • After merge: git log upstream/main..upstream/dev --oneline shows only post-v2.2.0 commits

Risks / Dependencies

  • Risk: /release-sync skill spec deviates from validators — the spec prescribes sync: commit type, sync(...) PR title, and sync/ branch prefix, but none of those are on the framework's whitelists. The merge commit slipped through (git merge -m bypasses the bash hook), but the carry-forward commit, PR title, and branch name all had to be retitled to chore. Filing a separate follow-up to update the spec.

Glossary

Term Definition
/release-sync Skill that syncs main→dev after each release. Step 9 of /release. Introduced in v2.1.0 (#403).
CHANGELOG carry-forward (step 5b) New step in /release-sync from PR #451 (#448) — restores main's CHANGELOG.md on dev after the -X ours merge correctly preserves dev's code but leaves CHANGELOG stale.
Squash divergence The SHA gap created when a release PR is squash-merged: main has one squash commit; dev still carries the un-squashed equivalents.

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