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gsxdsm 7824150715 FN-8769: protect default-branch mission merges

Keep mission group members behind manual release controls when their target is the default branch.

- Create deterministic intermediate branches for project-default mission groups.
- Gate default-branch group routing and auto-merge exemptions behind the normal manual-release flow.
- Cover intermediate and default-branch group behavior with core and engine tests.

Files changed:
 ...fn-8769-default-branch-group-auto-merge-gate.md |   7 ++
 docs/architecture.md                               |   2 +-
 docs/missions.md                                   |   2 +-
 .../mission-store.sync-auto-merge.test.ts          |   4 +-
 packages/core/src/__tests__/task-merge.test.ts     |  16 ++-
 .../core/src/async-stores/async-mission-store.ts   |  12 ++-
 packages/core/src/merge/task-merge.ts              |  23 +++-
 packages/core/src/missions/mission-store.ts        |  11 +-
 ...cutor-live-branch-group-auto-merge-hold.test.ts |  16 ++-
 .../src/__tests__/group-merge-coordinator.test.ts  | 118 ++++++++++++++++++++-
 .../engine/src/__tests__/project-engine.test.ts    |  16 ++-
 packages/engine/src/executor.ts                    |   4 +-
 .../engine/src/merge/group-merge-coordinator.ts    |  13 +++
 packages/engine/src/project-engine.ts              |  15 ++-
 14 files changed, 235 insertions(+), 24 deletions(-)

Fusion-Task-Id: FN-8769

Fusion-Task-Lineage: dff96c8e-ca96-437c-94bf-9691bdf572e9

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

2026-08-03 16:48:25 -07:00