docs: Add CHANGELOG.md for v0.1.0 release (#418)

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: sergei-rastrigin

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).
+
+## [0.1.0] - 2025-12-28
+
+### Added
+
+- **Transparent HTTPS Proxy** - Intercept and log all Claude Code API traffic
+- **Activity Monitoring** - Track tool calls, file access, and command execution
+- **Policy Enforcement** - Block dangerous operations based on organizational policies
+- **Zero Configuration** - Automatic client detection and policy application
+- **Multi-Tenant Architecture** - Centralized management across teams and organizations
+- **Real-time Log Streaming** - WebSocket-based live activity monitoring
+- **Web Dashboard** - Next.js admin UI for monitoring and configuration
+- **CLI Tool** - `arfa-cli` for proxy management and authentication
+
+### Security
+
+- JWT-based authentication
+- Row-level security for multi-tenancy
+- Secure credential storage
+
+[0.1.0]: https://github.com/rastrigin-systems/arfa/releases/tag/v0.1.0