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gsxdsm 36bd74e337 FN-7532: stamp branch group merge attribution

Ensure shared branch group members record merge attribution so completion checklists reflect real landed state.

- Route AI merges through branch-group merge routing before selecting the integration target.
- Stamp mergeDetails merge target fields for both landed and no-op finalize paths.
- Record shared-group member landing state and best-effort managed PR checklist sync after AI merges.
- Cover dashboard, CLI lifecycle, and merger scenarios for accurate branch-group completion counts.

Files changed:
 .changeset/fn-7532-branch-group-completion.md      |  7 ++
 docs/dashboard-guide.md                            |  2 +
 .../src/commands/__tests__/task-lifecycle.test.ts  | 29 +++++++
 .../src/__tests__/routes-branch-groups.test.ts     | 45 +++++++++++
 packages/engine/src/__tests__/merger-ai.test.ts    | 68 +++++++++++++++-
 packages/engine/src/merger-ai.ts                   | 90 +++++++++++++++++++++-
 6 files changed, 235 insertions(+), 6 deletions(-)

Fusion-Task-Id: FN-7532

Fusion-Task-Lineage: cd65c18a-f1ad-4f8b-99b2-2e61e233f042

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

2026-07-04 21:28:15 -07:00