fix(release): add verify-only npm recovery

[777genius]

Make post-publication verification genuinely retryable after workflow fixes.

The existing split publish/verify jobs prevent duplicate publication during a normal failed-job retry, but GitHub re-runs the original workflow SHA. If verifier code itself needs a fix, there was no safe way to run the corrected verifier against an immutable published version.

This adds a verify_only workflow input. In that mode:

• the protected publish job is skipped
• the publish-ready gate stays false
• no OIDC publish permission or npm environment is used
• package identity is resolved from the immutable release tag
• the public signature, SLSA provenance, and isolated add/info/doctor/update/remove lifecycle still run

The maintainer runbook and fail-closed contract test cover the recovery path.

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📥 Commits

Reviewing files that changed from the base of the PR and between b4bd54a and 704eaf5.

📒 Files selected for processing (3)

• .github/workflows/agentplugins-npm-publish.yml
• docs/agentplugins-release.md
• repotests/agentplugins_release_contract_test.go

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