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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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Comprehensive test suite with pytest
+- Structured logging system with rotating file handlers
+- Configuration file support (`.prrc`)
+- Token and cost tracking across sessions
+- Session persistence (save/load/export)
+- CI/CD pipeline with GitHub Actions
+- Custom exception hierarchy
+- Plugin system for custom tools
+- Multiple output formats (text, JSON, structured)
+- Input validation system
+- Progress indicators for long operations
+- Pre-commit hooks configuration
+- Comprehensive documentation (README, CONTRIBUTING, CHANGELOG)
+- Version flag (`--version`)
+- Better help text with examples
+- Session management commands
+- Usage statistics tracking
+
+### Changed
+- Improved argument parser with better help text
+- Enhanced error handling throughout codebase
+- Modular architecture with clear separation of concerns
+
+### Fixed
+- N/A (initial professional release)
+
+## [1.0.0] - 2025-01-XX
+
+### Added
+- Initial release with core functionality
+- Interactive and single-message modes
+- Autonomous execution mode
+- 16 built-in tools (filesystem, command, web, database, Python)
+- OpenRouter API integration
+- Context window management with summarization
+- Markdown rendering with syntax highlighting
+- Tool call visualization
+- Command history with readline
+- File versioning in SQLite database
+- Multiple context file support
+- Environment variable configuration
+- Model switching support
+- Verbose mode
+- API mode for specialized interaction
+
+### Core Features
+- **Assistant Core**: Main orchestrator with REPL loop
+- **API Communication**: OpenRouter integration with streaming
+- **Tool System**: Parallel execution with ThreadPoolExecutor
+- **Autonomous Mode**: Max 50 iterations with completion detection
+- **Context Management**: Automatic compression at 30 message threshold
+- **UI Components**: ANSI colors, markdown rendering, fancy displays
+
+### Tools Included
+- File Operations: read, write, list, mkdir, chdir, getpwd, index
+- Commands: run_command, run_command_interactive
+- Web: http_fetch, web_search, web_search_news
+- Database: db_set, db_get, db_query
+- Python: python_exec with persistent context
+
+### Configuration
+- Default model: x-ai/grok-code-fast-1
+- Temperature: 0.7
+- Max tokens: 8096
+- Context threshold: 30 messages
+- Max autonomous iterations: 50
+
+## Version History
+
+### Version Numbering
+
+- **Major** (X.0.0): Breaking changes
+- **Minor** (1.X.0): New features, backwards compatible
+- **Patch** (1.0.X): Bug fixes, backwards compatible
+
+### Release Schedule
+
+- Major releases: As needed for breaking changes
+- Minor releases: Monthly or when significant features are ready
+- Patch releases: As needed for bug fixes
+
+## Migration Guides
+
+### Upgrading to 1.0.0
+
+This is the initial professional release. If upgrading from development version:
+
+1. Install with `pip install -e .`
+2. Run `pr --create-config` to generate configuration file
+3. Set `OPENROUTER_API_KEY` environment variable
+4. Existing data in `~/.assistant_db.sqlite` will continue to work
+
+## Deprecation Notices
+
+None currently.
+
+## Known Issues
+
+None currently.
+
+## Future Releases
+
+### Planned for 2.0.0
+- Multi-model conversations
+- Enhanced plugin API with hooks
+- Web UI dashboard
+- Team collaboration features
+
+### Under Consideration
+- Docker containerization
+- Cloud deployment options
+- IDE integrations
+- Advanced code analysis tools
+
+---
+
+**Legend:**
+- `Added` - New features
+- `Changed` - Changes to existing functionality
+- `Deprecated` - Soon-to-be removed features
+- `Removed` - Removed features
+- `Fixed` - Bug fixes
+- `Security` - Security fixes