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>

config/config.example.yaml

@@ -0,0 +1,43 @@
+# Codex created 2025-12-29_0224
+device:
+  name: pilot-device
+  identifiers: ["pilot-device"]
+
+mqtt:
+  host: "127.0.0.1"
+  port: 1883
+  username: ""
+  password: ""
+  base_topic: "pilot"
+  discovery_prefix: "homeassistant"
+  client_id: "pilot-device"
+  keepalive_s: 60
+  qos: 0
+  retain_states: true
+
+features:
+  telemetry:
+    enabled: true
+    interval_s: 10
+  commands:
+    enabled: true
+    cooldown_s: 5
+    dry_run: true
+    allowlist: ["shutdown", "reboot", "sleep", "screen"]
+
+power_backend:
+  linux: "linux_logind_polkit"  # or linux_sudoers
+  windows: "windows_service"
+
+screen_backend:
+  linux: "gnome_busctl"  # or x11_xset
+  windows: "winapi_session"  # or external_tool
+
+publish:
+  heartbeat_s: 30
+  availability: true
+
+paths:
+  linux_config: "/etc/pilot/config.yaml"
+  windows_config: "C:\\ProgramData\\Pilot\\config.yaml"
+# Codex modified 2025-12-29_0224