One middleware, two ways to arrive at the same *Session, so every handler,
role guard, licence gate and audit call is untouched. The host guard
applies to both: a token carries an instance, and the tenant boundary must
not have a token-shaped hole in it.
The effective role is min(user, token) recomputed per request, so demoting
somebody demotes their tokens with them. A stale cookie beside a valid
bearer falls through rather than refusing a credential that would work.
mrhid6
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