docs(qa): access-security ledger edits from the 18.2.0 sweep, part 1

crud-permission-matrix, walled-environment-metadata-operator-only,
activation-write-operator-gate, anonymous-deny-surfaces and
anonymous-floor-v18-doors re-read on main and revised.

Co-authored-by: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GgKuGD9Ats95jBbJRZrf4a

Author: claude