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>

pilot-v2/target/debug/build/serde-0c79bc1bb5bf9eba/invoked.timestamp

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+This file has an mtime of when this was started.

pilot-v2/target/debug/build/serde-0c79bc1bb5bf9eba/out/private.rs

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+#[doc(hidden)]
+pub mod __private228 {
+    #[doc(hidden)]
+    pub use crate::private::*;
+}
+use serde_core::__private228 as serde_core_private;

pilot-v2/target/debug/build/serde-0c79bc1bb5bf9eba/output

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+cargo:rerun-if-changed=build.rs
+cargo:rustc-cfg=if_docsrs_then_no_serde_core
+cargo:rustc-check-cfg=cfg(feature, values("result"))
+cargo:rustc-check-cfg=cfg(if_docsrs_then_no_serde_core)
+cargo:rustc-check-cfg=cfg(no_core_cstr)
+cargo:rustc-check-cfg=cfg(no_core_error)
+cargo:rustc-check-cfg=cfg(no_core_net)
+cargo:rustc-check-cfg=cfg(no_core_num_saturating)
+cargo:rustc-check-cfg=cfg(no_diagnostic_namespace)
+cargo:rustc-check-cfg=cfg(no_serde_derive)
+cargo:rustc-check-cfg=cfg(no_std_atomic)
+cargo:rustc-check-cfg=cfg(no_std_atomic64)
+cargo:rustc-check-cfg=cfg(no_target_has_atomic)

pilot-v2/target/debug/build/serde-0c79bc1bb5bf9eba/root-output

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+/home/gilles/projects/pilot/pilot-v2/target/debug/build/serde-0c79bc1bb5bf9eba/out