admin_allowlist.is_admin: True only for an allowlisted HA user id;
False for non-allowlisted, unknown, empty-string, untrimmed variants,
None, non-strings (bools, lists), and an empty allowlist (nobody is
admin rather than everybody). Never raises for malformed input —
malformed means not admin; DB errors propagate for the Feature 09
gate to handle. The last-admin removal refusal (set_admin_ids) is
re-asserted as keeping the verdict sound. Tests: full verdict matrix,
empty-allowlist fail-closed, refusal persistence. Suite: 912 passed.
Joshua King
7cde256e2a