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gsxdsm 08a3f2851b FN-8919: harden stale agent link recovery

Normalize missing task lookup errors so stale durable-agent links do not halt self-healing sweeps.

- Treat thrown not-found and deleted task lookups as stale links.
- Isolate transient task lookup failures to their affected agent.
- Add recovery regression coverage and a patch changeset.

Files changed:
 .changeset/fn-8919-agent-link-sweep-fail-open.md   |  7 ++
 .../self-healing-agent-link-drift.test.ts          | 58 +++++++++++++--
 .../self-healing-path-utils-task-miss.test.ts      | 51 +++++++++++++
 packages/engine/src/__tests__/self-healing.test.ts | 84 +++++++++++++++++++++-
 .../engine/src/healing/self-healing-path-utils.ts  | 34 ++++++++-
 packages/engine/src/self-healing.ts                | 57 +++++++++++----
 6 files changed, 272 insertions(+), 19 deletions(-)

Fusion-Task-Id: FN-8919

Fusion-Task-Lineage: 6dca2c1d-8ff9-47fb-b6c1-24f5af57b499

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

2026-08-10 03:31:50 -07:00