feat: preflight dispatch guidance + pending verification

[4444J99]

Preflight surfaces dispatch recommendations and detects pending unverified handoffs. PR #10. DONE-286.

[github-actions]

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[4444J99]

Engagement disposition: distilled:conductor/preflight.py. I verified main includes preflight dispatch guidance and pending-verification detection: PreflightResult has dispatch and pending_handoff fields, _get_dispatch_guidance classifies scope through TaskDispatcher and recommends guardrailed handoff, and _check_pending_verification reads .conductor/active-handoff.md. tests/test_preflight_dispatch.py covers classification, pending handoff detection, and cleared handoffs.