chat.yakka.resolveChannel

Resolve a URL's channel segment, which may be a name or a TID. Called by the client's route guard before anything renders. The five outcomes are distinct on purpose. Collapsing them would either lie about deleted channels or hide gated ones, and both are facts a reader is entitled to. `forbidden` deliberately reveals that a channel exists — which is safe only because channels are whole spaces and the credential mint has already made the same disclosure (ADR 0007).