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Two Important findings from the final whole-branch review: T4-M3: RtcSession::channel_id/channel_state/is_closed lacked /// docs (AGENTS.md mandates /// on every public item; learner-facing code is a primary product). One-line docs added per existing /// style in rtc_session.rs. T7-M2: README "Status" section still read "Scoping. No code yet" — stale post-slice-1. Updated to reflect slice-1 implementation status; minimal edit, surrounding content preserved.