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The audio-locked attribute was correctly setting `muted = true` and posting `set-muted` to the iframe runtime, but on warm-cache reloads of claude.ai and inside the Claude desktop Electron client, the iframe finishes loading *after* the parent has already sent control messages — the iframe runtime's postMessage listener isn't installed yet, so the messages are silently dropped. Audio plays unmuted with no UI to recover. Confirmed via: - "First open" on claude.ai: cold cache, iframe slow → listener up before `set-muted` lands → audio muted ✅ - "Hard refresh" on claude.ai: warm cache, iframe fast → listener up after message arrives → message lost → audio plays ❌ - Claude desktop: Electron renderer consistently fast → race always loses → audio plays ❌ Fix: add a `{source: "hf-preview", type: "ready"}` event the runtime emits once `installRuntimeControlBridge` has registered the listener. The player listens for it and replays current bridge state (`set-muted`, `set-volume`, `set-playback-rate`). Pre-ready messages are now safe to send — they'll be replayed once the runtime can receive them. The replay is idempotent — re-asserting defaults is a no-op — so it's also safe across iframe reloads (new runtime instance emits ready again). Tests: 6 new (1 bridge: ready posted on install; 5 player: replays muted / volume / playback-rate / audio-locked-forced-mute / handles second ready / ignores ready from wrong source). Suites green: core 1387, player 137. Refs: - Investigation: heygen-com/hyperframes#1300 (UA-fallback attempt — unrelated to actual root cause) - claude.ai-web.log analysis revealed cross-origin iframe + race condition, not attribute stripping as originally hypothesized 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>