maaz519 3298401772 feat: enforce realtime delegation audience on the message socket
The socket used to accept any valid token, so a full REST/actor token could open the
live stream. Now it can require a narrowly-scoped delegated token (aud=iios-message),
so a leaked socket token can't drive privileged REST, and vice-versa.

- MessagePrincipal gains `audience`, surfaced from both verify paths (OIDC aud, and the
  app-token `aud` claim).
- message.gateway: when IIOS_REALTIME_AUDIENCE is set, handleConnection accepts only a
  token whose aud matches (opt-in, like IIOS_REQUIRE_ATTESTATION; unset = no change).
- spec: verifier surfaces aud; gateway accepts iios-message, rejects iios-core / no-aud
  when enforcing, passes through when off.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-15 12:56:19 +05:30
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