Add CHANGELOG.md with v0.1.0 release notes

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.1.0] - 2026-02-09
+
+### Added
+
+#### Core Project
+- ESP32-based BLE proxy using ESPHome (`esphome/ble-proxy.yaml`) for passive BLE advertisement scanning
+- Raspberry Pi fallback BLE poller (`pi-fallback/ble_poller.py`) for environments where ESPHome is not available
+- MQTT publisher (`pi-fallback/mqtt_publisher.py`) for publishing BLE device data to Home Assistant
+- Tuya BLE protocol support (`pi-fallback/tuya_ble.py`) for decoding proprietary sensor data
+- Home Assistant dashboard cards for plant monitoring (`home-assistant/dashboard/`)
+- Home Assistant automation for SGS01 sensor pokes (`home-assistant/automations/poke-sgs01.yaml`)
+- Systemd service unit for the Raspberry Pi BLE poller (`pi-fallback/ble-poller.service`)
+- Installation and setup scripts for Raspberry Pi (`pi-fallback/scripts/`)
+- Architecture documentation covering dual ESP32/RPi approach (`docs/architecture.md`)
+- Standard Operating Procedure guide (`docs/sop.md`)
+- Example configuration files for ESPHome secrets and Pi fallback config
+
+#### Developer Tooling
+- MIT License
+- `Makefile` with `lint`, `format`, `test`, and `install` targets
+- GitHub Actions CI workflow for Python, YAML, and Markdown linting (`.github/workflows/lint.yaml`)
+- Dependabot configuration for automated dependency updates (`.github/dependabot.yaml`)
+- EditorConfig for consistent editor settings across contributors (`.editorconfig`)
+- Ruff configuration for Python linting and formatting (`pi-fallback/ruff.toml`)
+- yamllint configuration (`.yamllint.yaml`)
+- markdownlint configuration (`.markdownlint.json`)
+- pre-commit hooks configuration (`.pre-commit-config.yaml`) integrating Ruff, yamllint, and markdownlint
+- Sorted imports, removed unused imports, and renamed unused variables across `pi-fallback/` to satisfy Ruff linting from the start
+- Relaxed markdownlint line-length rule to allow longer lines in documentation
+
+[Unreleased]: https://github.com/syscode-labs/homeassistant-ble-proxy/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/syscode-labs/homeassistant-ble-proxy/releases/tag/v0.1.0