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gsxdsm ab8ecb2206 FN-6634: remove engine merge trait hook registration

Remove the engine-side merge trait hook registration so core remains the sole owner of in-review field effects.

- Stop exporting or registering engine merge-trait onEnter/onExit hooks that collide with core workflow move effects.
- Document the store-owned merge queue handoff and core-owned scheduler-state clearing contract.
- Update merge-trait tests to assert ctx-shaped hook invocation and in-review scheduler state cleanup.
- Add a patch changeset for the published CLI package.

Files changed:
 .changeset/fn-6634-merge-trait-hook-collision.md  |   5 +
 packages/engine/src/__tests__/merge-trait.test.ts | 103 +++++++++-------
 packages/engine/src/index.ts                      |   1 -
 packages/engine/src/merge-trait.ts                | 138 +++++++---------------
 4 files changed, 107 insertions(+), 140 deletions(-)

Fusion-Task-Id: FN-6634

Fusion-Task-Lineage: fe7e2259-e354-4457-afd3-7ff25e5a1504

2026-06-18 06:41:22 -07:00