hasPermission()'s parameter was named userRole: string, shadowing the
module-level userRole role object exported earlier in the same file.
The internal roles map's `user: userRole` entry therefore bound to the
shadowed string parameter (e.g. "user") instead of the actual role
object — so any permission check for a "user"-role session (the only
non-admin role in the app) hit `"user".statements[resource]`, which is
undefined, and threw instead of returning false.
Net effect: every requirePermission()-gated route in the app returned
a 500 instead of a 403 for non-admin users. This predates phase 14 —
surfaced now because phase 14's PAX8 resolve route is admin-gated and
got exercised by a non-admin account during verification.
Renamed the parameter to roleName to remove the collision. Added
lib/permissions.test.ts (previously zero coverage on this file) to
lock in the "user"/admin/super-admin behavior and prevent regression.
