List active team members

Returns the full active roster when the team is public or the API key owner is an active team member; otherwise responds 403. The team is resolved by slug or Convex team ID and must be active, returning 404 if not found. Rows are sorted by role - captains first, then co-captains, then members - and each row's id is the membership row ID, not the user ID. Not paginated: every active member is returned in one response with a count, and there is no limit, cursor, or page token. Requires teams.roster:read.