feat(cacert): add CACert Transparency Log & Registry design (CEN-T)

[BrianCLong]

Motivation

• Close the governance gap by providing a non-repudiable, publicly auditable append-only transparency log for CACerts so issuance, omission, and equivocation are detectable.

Description

• Add the CEN‑T design doc at docs/CACERT_TRANSPARENCY_LOG_REGISTRY.md describing architecture (Merkle/RFC6962-style tree, STHs, witnesses), a ≤7-PR implementation stack (library, Merkle builder, server API, consistency proofs, CLI verifier, CI gate), deterministic JSON schemas (log_entry.json, inclusion_proof.json, consistency_proof.json), and structured failure/error cases; also register the initiative in docs/roadmap/STATUS.json.

Testing

• Validated the updated roadmap JSON with python -m json.tool docs/roadmap/STATUS.json which succeeded.

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Codex Task

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e516847c-50ae-4e43-9def-94c07f384346

📥 Commits

Reviewing files that changed from the base of the PR and between e87382b and 0afab53.

📒 Files selected for processing (2)

• docs/CACERT_TRANSPARENCY_LOG_REGISTRY.md
• docs/roadmap/STATUS.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/build-cacert-transparency-log-and-registry

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