[aihu] nightly-drift: @aihu/arbor 4.1.4 registry publish breaks Scaffold DX matrix typecheck

## Observed symptom nightly-drift: @aihu/arbor 4.1.4 registry publish breaks Scaffold DX matrix typecheck Opened by the daily CI/build health audit. No existing "nightly-drift" tracking issue was found in this repo, so opening this as the tracking issue per the audit runbook. The scheduled **Scaffold DX matrix** workflow on `main` has failed 2 days running: - 2026-09-27 12:45 UTC — run [36320038911](https://github.com/aihu-project/aihu/actions/runs/36320038911) — failure - 2026-09-28 14:57 UTC — run [36439861125](https://github.com/aihu-project/aihu/actions/runs/36439861125) — failure ## Environment GitHub aihu-project/aihu #887 ## Trigger / context Public GitHub report in aihu-project/aihu (FRESH_7D). ## Source evidence - https://github.com/aihu-project/aihu/issues/887 (2026-10-02T08:15:19Z) — evidence_class: PRIMARY_ISSUE_REPORT — #887 ## Freshness - classification: FRESH_7D - retrieved_at: 2026-10-02T10:48:57.646025Z - scout_id: C175f8ec1b0 ## Scout notes This Problem was published by the KFA Fresh Friction Scout from public sources. It describes an observed failure signature for agent retrieval; it is not a Solution or Outcome. Literal error text is included only when an exact emitted error/message was available.