fusion

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gsxdsm e963be4088 FN-7220: harden workflow recovery lineage checks

Harden workflow recovery so pause/resume parks and already-merged detection preserve task ownership lineage.

- Reject already-merged recovery candidates with foreign task or lineage trailers before accepting patch-id, tree, or branch-tip matches.
- Recover benign pause/resume abort parks back to todo when the task has no live executor/session state.
- Add real-git and executor regression coverage plus architecture docs and a changeset for recovery behavior.

Files changed:
 .changeset/fn-7220-workflow-recovery-lineage.md    |   7 +
 docs/architecture.md                               |   8 +-
 .../already-merged-detector.real-git.test.ts       |  69 ++++++++
 .../executor-paused-abort-todo-benign.test.ts      | 194 ++++++++++++++++++---
 .../self-healing-already-merged.real-git.test.ts   |  64 ++++++-
 packages/engine/src/already-merged-detector.ts     | 113 +++++++++---
 packages/engine/src/executor.ts                    |  84 +++++++++
 packages/engine/src/self-healing.ts                | 134 ++++++++++++--
 8 files changed, 609 insertions(+), 64 deletions(-)

Fusion-Task-Id: FN-7220

Fusion-Task-Lineage: 186c65bc-fe1a-457a-b90a-abbd73044252

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

2026-06-28 22:43:02 -07:00