Brainstorming spec for ADR-021: operational access as a deployment
deliverable. Two layers (host baseline + per-service), a three-tier
access ladder (mesh SSH -> LAN SSH from ubongo -> console break-glass),
declarative access__* data rendering ACCESS.md and driving a
/check-access verifier. Resolves TODO 3.2 (API access) and 7.2 (host
access); amends ADR-016 (SSH also from ubongo) and ADR-020
(ssh-from-control source).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
