Two-level module access: tenant activation stays a prerequisite, plus new
per-group and per-user grants. Records the four design decisions taken with
the user: Tessera-owned groups with optional AD binding, closed-by-default
access, ADMIN/SUPER_ADMIN bypass within their tenant, and access on/off only
(no permission levels inside modules). Starts milestone v1.2.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
