docs(adr): accept ADR-0032 holdout filtering boundary

[PhysShell]

ADR-0032 has completed independent review at exact head c44a89ccfc29fc9df42c58b5a48d469076db05a3 and was merged to main as 6f04c21400ead9e7350de480122c2957823ba29b.

The accepted contract fixes:

• offline Reachability Lab ownership;
• authoritative LoadedCorpus binding;
• absence-capable corpus preparation;
• distinct NoCorpus, LeakyDiagnostic, and HoldoutTargetSong semantics;
• fail-closed song preflight and filtering before CorpusMaterial construction;
• production generation and reranking remain untouched.

This PR changes status only (Proposed → Accepted in the ADR and its README index row). Implementation remains a separate RED→GREEN slice. No decisions.log.md change, no code, no wording change to the accepted contract.

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📥 Commits

Reviewing files that changed from the base of the PR and between 6f04c21 and 0c16104.

📒 Files selected for processing (2)

• docs/adr/0032-holdout-filtering-boundary.md
• docs/adr/README.md

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