fix: verify production OIDC identities cryptographically

[seonghobae]

Superseded integration lane

This PR is closed without merge because its historical branch diverged from current protected develop and cannot be safely integrated as-is. The valuable OIDC implementation remains preserved at clean pre-reconciliation commit bfb517cf0ef1ecfab485c4cebc7d2c12c9822fae.

A later attempted ancestry-only reconciliation commit (a5a0f3cc1c7708f57cc7474098121c84c9e7cff8) proved unsafe: although it added current develop as a parent, it retained the historical tree and therefore made the PR diff delete or weaken already-integrated attachment, Clearfolio, session-revocation, coverage, and security behavior. That commit is explicitly rejected as integration evidence and must never be merged.

The next OIDC lane must start from the exact current protected develop tree and reapply only the intended OIDC changes from bfb517c: server/oidc.mjs, OIDC route/unit tests, OIDC documentation/CHANGELOG, package test/coverage registration, and the narrowly scoped OIDC integration in server/app.mjs. It must preserve all current develop security and operability behavior and generate fresh exact-head CI/security/review evidence.

No predecessor-head or historical Security Scan result transfers.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: fd4a5538-61a2-4f32-bcd3-5c7fca2955d7

📥 Commits

Reviewing files that changed from the base of the PR and between b88e66e and a5a0f3c.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (20)

• CHANGELOG.md
• docs/deploy.md
• docs/doctoring/attachment-status-refresh.md
• docs/doctoring/session-revocation.md
• docs/oidc-production.md
• package.json
• server/app.mjs
• server/attachment_status.mjs
• server/auth.mjs
• server/clearfolio.mjs
• server/oidc.mjs
• tests/api/attachment-status.test.mjs
• tests/api/oidc-route.test.mjs
• tests/api/session-revocation.test.mjs
• tests/api/smoke.mjs
• tests/unit/attachment-status.test.mjs
• tests/unit/clearfolio-adapter-mock-hmac.test.mjs
• tests/unit/clearfolio-status-signal.test.mjs
• tests/unit/coverage-script-contract.test.mjs
• tests/unit/oidc.test.mjs

✨ Finishing Touches 💡 2

⚔️ Resolve merge conflicts 💡

• Resolve merge conflict in branch fix/oidc-production-verification-20260809

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/oidc-production-verification-20260809

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