Adds typed role accessors to make participant-list filtering
self-documenting:
ParticipantTag.effectiveRole(): ROLE? — case-insensitive parse;
null when the role string doesn't match any enum value (so an
unknown future "director" role doesn't accidentally pass canSpeak).
ParticipantTag.isHost() / isModerator() / isSpeaker() — single-role
predicates for per-row UI gating.
ParticipantTag.canSpeak() — true for HOST / MODERATOR / SPEAKER;
the audio-room VM uses this to gate startBroadcast() so anyone who
was promoted (not just the original host) can publish.
5 unit tests cover happy paths, case-insensitivity, the
unknown-role → null contract, the canSpeak union, and the
effectiveRole enum parse.
Tier 1 #5 + #6 consume these — promote/demote and kick both need
to render different rows depending on whether the local user is a
host or moderator (allowed to manage roles) and the target
participant's current role.
Claude
9fa6f756ca