Pilot v2: Core implementation + battery telemetry

Major updates:
- Complete Rust rewrite (pilot-v2/) with working MQTT client
- Fixed MQTT event loop deadlock (background task pattern)
- Battery telemetry for Linux (auto-detected via /sys/class/power_supply)
- Home Assistant auto-discovery for all sensors and switches
- Comprehensive documentation (AVANCEMENT.md, CLAUDE.md, roadmap)
- Docker test environment with Mosquitto broker
- Helper scripts for development and testing

Features working:
✅ MQTT connectivity with LWT
✅ YAML configuration with validation
✅ Telemetry: CPU, memory, IP, battery (Linux)
✅ Commands: shutdown, reboot, sleep, screen (dry-run tested)
✅ HA discovery and integration
✅ Allowlist and cooldown protection

Ready for testing on real hardware.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

scripts/mqtt_send.py

@@ -0,0 +1,34 @@
+# Script simple pour publier des commandes MQTT (tests manuels).
+import argparse
+import time
+
+import paho.mqtt.client as mqtt
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Envoi de commandes MQTT pour pilot-v2")
+    parser.add_argument("--host", default="127.0.0.1")
+    parser.add_argument("--port", type=int, default=1883)
+    parser.add_argument("--device", required=True)
+    parser.add_argument("--action", required=True, choices=["shutdown", "reboot", "sleep", "screen"])
+    parser.add_argument("--value", required=True, choices=["ON", "OFF"])
+    parser.add_argument("--username", default="")
+    parser.add_argument("--password", default="")
+    args = parser.parse_args()
+
+    topic = f"pilot/{args.device}/cmd/{args.action}/set"
+
+    client = mqtt.Client()
+    if args.username or args.password:
+        client.username_pw_set(args.username, args.password)
+
+    client.connect(args.host, args.port, 60)
+    client.loop_start()
+    client.publish(topic, args.value, qos=0, retain=False)
+    time.sleep(0.5)
+    client.loop_stop()
+    client.disconnect()
+
+
+if __name__ == "__main__":
+    main()