fix(lint): exempt retired claims from stale check

[Steve-too]

Summary

vouch lint was the odd one out: metrics.py and digest.py both already exempt retired statuses (superseded/archived/redacted) from their stale checks, with comments explicitly describing this as lint's intended behaviour. Lint was running the stale check over every claim with no status guard, producing stale_claim warnings for retired claims — non-actionable noise since retired claims are terminal and not expected to be refreshed.

Changes

• Add _RETIRED_CLAIM_STATUSES to health.py (mirrors the constant in digest.py and the local set in metrics.py)
• Wrap the stale-claim check in lint() with if c.status not in _RETIRED_CLAIM_STATUSES
• Two new tests: retired claims are exempt, active claims are still flagged

Repro

Register a source, add an archived claim whose updated_at is older than the freshness window (e.g. 400 days). vouch lint emits a stale_claim finding; vouch metrics and vouch digest do not.

Closes #478

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