feat(01-07): add tiered browser ASR and wire push-to-talk into the shared turn loop

feat(01-07): add push-to-talk capture with a three-condition pre-ASR gate

feat(01-06): drive the standalone harness from the generated timeline

test(01-03): enforce the transport seam statically and in a real browser

feat(01-03): add both transports, the standalone stage page and the Gradio component

feat(01-03): add the single facade builder and the shared turn loop

feat(01-03): add the transport-agnostic VRM stage, viseme player and audio queue

feat(01-01): add the VRM tutor character and record its license facts