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gsxdsm ba610a1c0e FN-6296: fix stuck-kill force-requeue cleanup

Reap hung executor surfaces before requeueing stuck-kill timeout tasks.

- terminate spawned child agents and active session surfaces before clearing execution guards
- remove stale worktrees during force-requeue while preserving concurrent recovery ownership
- add regression coverage and architecture notes for the cleanup contract

Files changed:
 docs/architecture.md                               |   2 +
 .../engine/src/__tests__/executor-recovery.test.ts | 248 ++++++++++++++++++++-
 packages/engine/src/executor.ts                    |  61 ++++-
 3 files changed, 305 insertions(+), 6 deletions(-)

Fusion-Task-Id: FN-6296

Fusion-Task-Lineage: a393e2b1-a72c-4d7b-9de2-6bf7268986d4

2026-06-12 14:08:52 -07:00