fix: Use correct hf command for Qwen3-TTS download (#46)

* chore: fix unused import warnings in qwen3-tts module

- Remove unused import 'IndexOp' in model.rs
- Remove unused import 'DType' in speech_tokenizer.rs
- Add #[allow(dead_code)] to codebook_dim field in RvqCodebook

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* feat: add voice loading and selection for TTS cloning

Add voice reference audio loading so the TTS speak handler can perform
voice cloning using reference WAV files from the voices/ directory.

- Add voice.rs module: loads manifest.json and reference.wav for a given
  voice_id, decodes via symphonia, resamples to 24kHz for the TTS engine
- Update speak.rs: resolve voice_id from the speak request (default
  "makima"), load reference audio, pass it to engine.generate()
- Add voices/makima/README.md with instructions for obtaining reference
  audio (extraction from YouTube, recording, ffmpeg conversion)
- Graceful fallback: if reference audio is missing, TTS proceeds without
  voice cloning using the model's default voice

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* feat: add inference cancellation support for TTS generation

Add cooperative cancellation via Arc<AtomicBool> cancel flag that
threads through TtsEngine::generate -> Qwen3Tts -> GenerationContext.
The autoregressive loop and streaming decoder check the flag each
iteration and break early when set. The speak WebSocket handler
creates a per-session flag, passes it to generate, and sets it on
Cancel/Stop/Close messages.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add Qwen3-TTS model download to build process

Fix TTS engine failure due to missing tokenizer by downloading
Qwen3-TTS models during Docker build:
- Download model.safetensors, config.json, tokenizer.json, and
  tokenizer_config.json from Qwen/Qwen3-TTS-12Hz-0.6B-Base
- Download speech tokenizer from Qwen/Qwen3-TTS-Tokenizer-12Hz
- Add QWEN3_TTS_DIR environment variable to Dockerfile
- Script supports both env var override and default path

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: use correct hf command for Qwen3-TTS download

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/makima/sh/download-models.sh b/makima/sh/download-models.sh
index 1aefad8..4d791af 100755
--- a/makima/sh/download-models.sh
+++ b/makima/sh/download-models.sh
@@ -128,7 +128,7 @@ download_qwen3_tts() {
 
     # Download base TTS model files from Qwen/Qwen3-TTS-12Hz-0.6B-Base
     echo "Downloading Qwen3-TTS-12Hz-0.6B-Base..."
-    huggingface-cli download Qwen/Qwen3-TTS-12Hz-0.6B-Base \
+    hf download Qwen/Qwen3-TTS-12Hz-0.6B-Base \
         model.safetensors \
         config.json \
         tokenizer.json \
@@ -138,7 +138,7 @@ download_qwen3_tts() {
     # Download speech tokenizer from Qwen/Qwen3-TTS-Tokenizer-12Hz
     echo "Downloading Qwen3-TTS-Tokenizer-12Hz..."
     local tmpdir=$(mktemp -d)
-    huggingface-cli download Qwen/Qwen3-TTS-Tokenizer-12Hz \
+    hf download Qwen/Qwen3-TTS-Tokenizer-12Hz \
         model.safetensors \
         --local-dir "$tmpdir"
     mv "$tmpdir/model.safetensors" "$QWEN3_TTS_DIR/speech_tokenizer.safetensors"