CRITICAL: djs/voice stores the DAVESession wrapper at net.state.dave
(createDaveSession assigns to state.dave on op4 SessionDescription), NOT
inside connectionData. decryptVideoPacket looked up connectionData.dave which
is ALWAYS undefined -> every video packet hit '!dave?.session' guard and was
silently dropped, so no .h264/.mp4 ever got written despite the handshake
reaching Ready.
Fix: pass net.state.dave as a separate arg (the wrapper has .session ->
Davey.DAVESession) so the DAVE-layer decrypt (MediaType.VIDEO) actually runs.
Typecheck + build pass, lint clean (src/), 179/179 tests.