Initial scaffold: ESP32-P4 firmware + voice gateway for Tatlock endpoint

DeskLock gives the Tatlock butler a face and voice on a Waveshare
ESP32-P4-WIFI6-Touch-LCD-3.4C round display in the living room.

- firmware/: ESP-IDF project targeting esp32p4 with the Waveshare XC BSP
- gateway/: FastAPI voice bridge (faster-whisper STT, Tatlock chat, Piper TTS)
- docs/architecture.md: component design and device<->gateway WS protocol

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

gateway/Makefile

@@ -0,0 +1,25 @@
+.PHONY: setup run test lint typecheck clean
+
+setup:
+	python3 -m venv .venv
+	.venv/bin/pip install -e ".[dev]"
+
+setup-speech:
+	.venv/bin/pip install -e ".[dev,speech]"
+
+run:
+	.venv/bin/uvicorn desklock_gateway.main:app --host 0.0.0.0 --port 8600 --reload
+
+test:
+	.venv/bin/pytest
+
+lint:
+	.venv/bin/ruff check src tests
+	.venv/bin/ruff format --check src tests
+
+typecheck:
+	.venv/bin/mypy src
+
+clean:
+	rm -rf .venv .pytest_cache .ruff_cache .mypy_cache
+	find . -type d -name __pycache__ -exec rm -rf {} +