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

docs(01-01): record the ZeroGPU hosting decision and wire the Space remote

docs(01-04): record the measured cold-start cost of the lazy runtime fetch

test(01-04): capture ground-truth synthesis fixtures for AVTR-02

feat(01-04): implement synthesize() and the shared voice dataclasses

feat(01-04): add VOICEVOX runtime assets, requirements.txt and setup docs