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Fusion Agent 2430ce69b0 FN-112: capture workspace merge evidence from task worktrees

Capture workspace merge evidence from immutable acquisition baselines to persisted task branches so real linked task worktrees land reviewed changes reliably.

- Compare review fingerprints and landing ranges against the persisted task branch rather than the live worktree HEAD.
- Add linked-task-worktree regression coverage for per-repository landing proof and exactly-once finalization.
- Document the regression and publish the workspace merge fix in a patch changeset.

Files changed:
 .../fn-112-workspace-task-worktree-evidence.md     |  7 ++++
 docs/architecture.md                               |  1 +
 ...e-empty-merge-boundary-finalization-livelock.md |  8 +++-
 .../engine/src/__tests__/_workspace-fixture.ts     | 15 ++++++++
 .../engine/src/__tests__/workspace-e2e.test.ts     | 31 ++++++++++++---
 .../__tests__/workspace-merger-scope-gates.test.ts |  2 +-
 .../engine/src/__tests__/workspace-merger.test.ts  | 45 +++++++++++++++++++++-
 packages/engine/src/merge/merger-ai.ts             | 29 ++++++++++++--
 8 files changed, 125 insertions(+), 13 deletions(-)

Fusion-Task-Id: FN-112

Fusion-Task-Lineage: 66e8498e-13f2-461b-ae38-bf750383115b

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

2026-08-23 01:35:06 +00:00