feat: initial project scaffold — server, client, Android APK

- FastAPI server with audio mixer (Windows + Voicemeeter), media tracking,
  notifications (progress + alerts), telemetry, and system tray .exe build
- Test suite covering notifications, audio mixer, media, telemetry, and API
- E-Ink web client (vanilla JS, DOM API, block meters, swipe gestures)
- Android WebView APK for BOOX Go 7 Color Gen II (Android 13, Kotlin)
- Design decision records in .pi/docs/design/
- PyInstaller build script for server .exe

server/tests/test_telemetry.py

@@ -0,0 +1,59 @@
+"""Tests for the telemetry module."""
+
+from __future__ import annotations
+
+
+from ..telemetry import SensorReading, TelemetryManager, TelemetryState
+
+
+class TestSensorReading:
+    def test_defaults(self) -> None:
+        reading = SensorReading(name="CPU Temp", value=65.0, unit="C")
+        assert reading.name == "CPU Temp"
+        assert reading.value == 65.0
+        assert reading.unit == "C"
+        assert reading.category == ""
+
+    def test_with_category(self) -> None:
+        reading = SensorReading(name="GPU Usage", value=72.0, unit="%", category="GPU")
+        assert reading.category == "GPU"
+
+
+class TestTelemetryState:
+    def test_defaults(self) -> None:
+        state = TelemetryState()
+        assert state.cpu_temp == 0.0
+        assert state.gpu_temp == 0.0
+        assert state.sensors == []
+
+    def test_with_values(self) -> None:
+        state = TelemetryState(
+            cpu_temp=72.5,
+            gpu_temp=68.0,
+            cpu_usage=45.0,
+            sensors=[
+                SensorReading(name="CPU", value=72.5, unit="C"),
+            ],
+        )
+        assert state.cpu_temp == 72.5
+        assert len(state.sensors) == 1
+
+
+class TestTelemetryManager:
+    def test_init(self) -> None:
+        manager = TelemetryManager()
+        assert manager._state is not None
+
+    def test_get_state_returns_dict(self) -> None:
+        manager = TelemetryManager()
+        state = manager.get_state()
+        assert isinstance(state, dict)
+        assert "cpu_temp" in state
+        assert "gpu_temp" in state
+        assert "sensors" in state
+
+    def test_get_state_empty(self) -> None:
+        manager = TelemetryManager()
+        state = manager.get_state()
+        assert state["cpu_temp"] == 0.0
+        assert state["sensors"] == []