feat: scaffold tuimble TUI mumble client

Core modules: TUI app (textual), mumble protocol client,
audio pipeline (sounddevice + opus), push-to-talk with
kitty protocol / evdev / toggle backends. Config via TOML.

Makefile

@@ -0,0 +1,26 @@
+.PHONY: setup run lint test clean
+
+VENV := .venv
+PIP := $(VENV)/bin/pip
+PY := $(VENV)/bin/python
+
+setup: $(VENV)/bin/activate
+
+$(VENV)/bin/activate:
+	python3 -m venv $(VENV)
+	$(PIP) install --upgrade pip
+	$(PIP) install -e ".[dev]"
+
+run: setup
+	$(PY) -m tuimble
+
+lint: setup
+	$(VENV)/bin/ruff check src/ tests/
+	$(VENV)/bin/ruff format --check src/ tests/
+
+test: setup
+	$(VENV)/bin/pytest -v
+
+clean:
+	rm -rf $(VENV) dist build *.egg-info .pytest_cache .ruff_cache
+	find . -type d -name __pycache__ -exec rm -rf {} +