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FN-5788: add group promotion gate to merge coordinator

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Add lifecycle wiring so branch-group promotion respects group-level auto-merge gating.

- Extend merge coordinator/merger flow to apply group promotion precedence and pause/override reasons.
- Hook the group-promotion coordinator into engine lifecycle startup.
- Add reliability and coordinator coverage for branch group promotion gating behavior.
- Add release changeset and update architecture/AGENTS backstop notes.

Files changed:
 .changeset/fn-5788-branch-group-promotion-gate.md  |   5 +
 AGENTS.md                                          |   1 +
 docs/architecture.md                               |   3 +-
 .../src/__tests__/group-merge-coordinator.test.ts  |  95 ++++++++++++++-
 .../branch-group-promotion-gate.test.ts            | 129 +++++++++++++++++++++
 packages/engine/src/group-merge-coordinator.ts     |  46 +++++---
 packages/engine/src/index.ts                       |   2 +
 packages/engine/src/merger.ts                      |  34 +++---
 8 files changed, 283 insertions(+), 32 deletions(-)

Fusion-Task-Id: FN-5788

Fusion-Task-Lineage: 5930f662-908e-4cf0-a0d4-68b2f4360074
This commit is contained in:
gsxdsm
2026-05-31 15:59:59 -07:00
parent 06d84905ba
commit 7b70e7fb72
8 changed files with 287 additions and 36 deletions
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.changeset/fn-5788-branch-group-promotion-gate.md Normal file
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---
"@runfusion/fusion": minor
---
Add a branch-group promotion eligibility hook to the engine merge lifecycle via `evaluateBranchGroupPromotion`, and emit `merge:branch-group-promotion-gated` audit telemetry whenever shared-group member landings are evaluated for downstream group→default promotion readiness.