- Integrated `mcutie` library as a core MQTT client for device communication.
- Added support for Home Assistant entities (binary sensor, button) via MQTT.
- Implemented buffer management, async operations, and packet encoding/decoding.
- Introduced structured error handling and device registration features.
- Updated `Cargo.toml` with new dependencies and enabled feature flags for `serde` and `log`.
- Enhanced logging macros with configurable options (`defmt` or `log`).
- Organized codebase into modules (buffer, components, IO, publish, etc.) for better maintainability.
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