CHW-4716 PersonaUnknown

persona value is not recognised; supported values are appsec, devsecops, enterprise_it

Default message: persona value is not recognised; supported values are appsec, devsecops, enterprise_it
HTTP status: 400 (client)

Problem. POST /api/users/me/persona rejected a non-empty persona value. Cause. The value did not match any entry in knownPersonas — typically a typo. Fix. Use one of the canonical lowercase identifiers: appsec, devsecops, enterprise_it. HTTP 400.