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Fusion Agent 926dda6fc7 FN-078: repair multi-repository workspace merge coordination

Keep long-running workspace land operations live and enforce repository-local scope isolation.

- Renew workspace land leases throughout dependency sync, AI merge, push, and intent resolution.
- Abort stale land bodies before durable or remote commit points and fence lease-dependent writes.
- Centralize repository File Scope resolution across squash, completion, and checkout guards.
- Add regression coverage, architecture documentation, and a patch changeset.

Files changed:
 .changeset/fn-078-workspace-lease-and-scope.md     |   7 +
 docs/architecture.md                               |   3 +-
 .../executor-workspace-main-checkout-guard.test.ts |  13 ++
 .../__tests__/executor-workspace-taskdone.test.ts  |  21 +++
 .../src/__tests__/workspace-merger-lease.test.ts   | 195 ++++++++++++++++++++-
 .../src/executor/workspace-main-checkout-guard.ts  |   4 +-
 .../src/executor/worktree-task-done-scope-leak.ts  |   4 +-
 .../engine/src/merge/merger-ai-squash-gates.ts    |   9 +-
 packages/engine/src/merge/merger-ai.ts             |  55 +++++-
 packages/engine/src/worktree/workspace-paths.ts   |  26 +++
 10 files changed, 321 insertions(+), 16 deletions(-)

Fusion-Task-Id: FN-078

Fusion-Task-Lineage: 8ddfa438-d6c0-4d3a-972a-3594bfc05ffb

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

2026-08-21 04:32:53 +00:00