[patch] Restore applied publisher contract

[libops-agent]

Summary

• restore the cleanup-safe immutable shared publisher revision already authorized for Vault Proxy
• keep the signing certificate identity and contract test on that exact revision

Validation

• Go publication contract tests
• actionlint
• git diff --check

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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