fix(breakfix): require retirement notice evidence

[osu]

Summary

Hardens BFX02-02 so a generic lifecycle record cannot be treated as retirement-notice evidence.

A PASS now requires:

• provider-origin evidence
• an explicit instance, machine, node, or rack target
• a retirement-specific notice type
• a timezone-aware scheduled retirement timestamp

Generic scheduled, CLOSED, DOWN, drained, maintenance, self-reported, and event-issued-time-only records do not pass.

Live GB300 validation

Read-only validation on Mississippi confirmed that BCM and Slurm are queryable, but no authoritative retirement notice is currently present:

• BCM event query succeeded with zero retirement or decommission notices
• persisted BCM events contained zero retirement or decommission matches
• 144 Slurm node records contained zero retirement or decommission matches

The live result is SKIP/unproven, not PASS. This PR prevents a false positive and does not close the requirement until a real provider-issued retirement notice can be observed.

Tests

• 42 focused break-fix tests passed
• make test and make demo-test passed
• suite wiring, Ruff, formatting, and pre-commit passed

Part of #212

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[osu]

/ok to test 661f442

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_{🕐 Last updated: 2026-08-21 18:44:22 UTC | Commit: 661f442}