Add tools/macstudio/smoke_e2e.py exercising the full voice-bridge loop
(/health/ready, /tts, /voice/ws hello+stream+intent+TTS, /tts/cache/stats)
without requiring the ESP32 firmware. Three modes (tts/ws/full); generates
a French PCM16 16 kHz fixture via `say -v Thomas` + afconvert when needed;
saves received WAVs and a structured JSON report under /tmp.
Wires `make smoke-voice` and documents the smoke test under
tools/macstudio/README.md (prereqs, exit codes 0/1/2, typical latencies).
Local run hit /tts cache miss + WS round-trip in ~3 s with cache hit on
the second pass; cache delta logging confirmed.
L'électron rare
5a0a6cc073