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Server: - POST /v1/groups/:name/signal — broadcast plaintext JSON to all online group members via WS push (for call signals, typing, etc.) - No auth required (membership validated from 'from' field) Web client: - Group call signals now use /signal endpoint (was broken with /send) - WS handler detects group_call JSON signals early - Auto-join #ops now properly registers presence + fetches members - /gmembers resolves ETH addresses via /v1/resolve - /admin-calls — list all active calls in the system - /admin-help — list all admin/debug commands Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>