apply() guarded on mic.getProcessor(), which is only set after setProcessor()
resolves (after the whole wasm/model load), so mic-published followed by
camera-published constructed two processors — two AudioContexts, two model
loads, double lock hold time. Track the in-flight processor per room, skip
apply() while one is pending, and destroy a pending processor if the module
is torn down before setProcessor resolves. Unit-tested.
Fixes#10
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA
