Users who may edit contacts but not users (Service, Sales, Accounting) could
give a contact login any role, BizAdmin and OpsAdmin included, and roles are
what every check uses (security review F28). Now:
- saving a Customer or HeadOffice user with any role other than Customer or
CustomerRestricted is refused (error on Roles);
- UserBiz.EffectiveRoles masks a contact's roles to the customer roles wherever
they are applied: the token middleware, download-key routes, and the
notification subscriber check, so contacts that already have staff roles
stored act without them.
Checked: Service creating a contact with BizAdmin refused, with Customer works;
a contact with OpsAdmin stored in the database gets 403 downloading a log file.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>