fusion

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gsxdsm 20184acdfd FN-7486: fix no-diff merge recovery ownership checks

Fix no-op task branch recovery by recognizing canonical branches with no unique diff before rejecting inherited foreign trailers.

- Add no-diff ownership classification for already-merged detection when canonical task branches inherit another task's landed commit.
- Teach self-healing and branch-misbound recovery to ignore foreign branch-tip trailers only for branches proven to have no unique task diff.
- Skip synthetic verify:fast typechecks for JavaScript alias packages without tsconfig files and cover the behavior with tests.
- Add regression coverage and a patch changeset for the recovery fix.

Files changed:
 .changeset/fn-7486-merge-recovery-noop-ownership.md       |  7 ++
 .../already-merged-detector.real-git.test.ts       | 68 +++++++++++++++++
 .../self-healing-already-merged.real-git.test.ts   | 89 ++++++++++++++++++++--
 packages/engine/src/already-merged-detector.ts     | 88 +++++++++++++++------
 packages/engine/src/self-healing.ts                | 61 +++++++++++++--
 scripts/__tests__/verify-fast.test.mjs             | 16 +++-
 scripts/verify-fast.mjs                            | 15 +++-
 7 files changed, 303 insertions(+), 41 deletions(-)

Fusion-Task-Id: FN-7486

Fusion-Task-Lineage: 4185c6ed-9731-4ffc-b033-34bf0c3a83ad

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-07-03 22:04:45 -07:00