test(agents): mode-card skill-reference closure + autoresearch entry-points re-point

[aarontrowbridge]

Summary

• Closure suite (test/skill_reference_closure.test.ts): every skill-invocation directive in all agent cards must resolve against repo skills plus the committed internal-registry fixture (develop, director-core, implement-issue); registry entries are cross-checked against the armonissima team mount when present (conditional, same pattern as the mode-card parity suite). Non-vacuous guards on both the card side and the registry side.
• autoresearch skill entry-points re-point: the card's first action invokes director-core (canonical loop protocol); this skill is the research-mode instantiation carrying what director-core deliberately does not (spec-gate review budget, checkout registry, probe/experiment boundary). Conflict rule: director-core wins; report the conflict, never resolve it by edit.

Born from the 2026-08-23 outage: both mode cards invoke director-core first, the server's staging allowlist omitted it, and runtime died with skill director-core unavailable. CI now catches what staging forgets.

Closes #537

Verification

• npm test — 107 files / 1515 tests, full suite green (run on this branch)
• npm run typecheck — clean
• Runtime half hardened server-side the same day: staging script now carries a reference audit; negative control (simulated unstaged director-core) fires the WARN

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