WS-6 v1.3-delta D2 ships the broadcast channel auth callback in
routes/channels.php with submitter-only scope. Org-admin access is
deferred because the codebase has no vetted Spatie Permission helper
for organisation-scoped role checks; guessing the API would risk
incorrect authorisation without test coverage.
Tracking entry under "Technische schuld", referenced from the inline
TODO in routes/channels.php and the v1.3-delta D2 PR description.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>