fix: show pip output, handle incomplete venv, fix TF version for Python 3.12

- tensorflow-cpu==2.15.0 only supports Python <=3.11; relax to >=2.16.0
- capture_output=False so pip errors are visible in ComfyUI logs
- clean up incomplete venv dir before retrying install

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/install_extract_env.sh

@@ -27,7 +27,7 @@ echo "[PrismAudio] Installing PyTorch stack..."
 
 echo "[PrismAudio] Installing feature-extraction dependencies..."
 "${PIP}" install \
-    "tensorflow-cpu==2.15.0" \
+    "tensorflow-cpu>=2.16.0" \
     "jax[cpu]" \
     "jaxlib" \
     "transformers" \