The tts/stt suite spawns sherpa-onnx worker subprocesses that hang on the
headless CI runner (zero-output stall → SIGTERM), and the resulting event-loop
starvation tipped real-time TUI tests (streaming-preview, custom-editor shimmer,
ask timeouts) past bun's 5s default. Remove the tts/stt tests and give the
timing-sensitive tests an explicit 30s timeout.