Convert CHANGELOG.md to AsciiDoc

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+// SPDX-License-Identifier: AGPL-3.0-or-later
+= Changelog
+
+**SPDX-License-Identifier: MIT OR AGPL-3.0-or-later**
+
+All notable changes to vext 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
+- RSR (Rhodium Standard Repository) compliance framework
+- Comprehensive documentation suite (README, INSTALLATION, USAGE, FEATURES)
+- Palimpsest dual licensing (MIT OR AGPL-3.0-or-later)
+- Tri-Perimeter Contribution Framework (TPCF) governance
+- RFC 9116 compliant `.well-known/security.txt`
+- AI training policy (`.well-known/ai.txt`)
+- Team attribution (`.well-known/humans.txt`)
+- Automated RSR compliance checker (`tools/rsr_checker.py`)
+- Nix flakes for reproducible builds (`flake.nix`)
+- justfile for build automation
+- GitLab CI/CD configuration
+- Comprehensive security policy (SECURITY.md)
+- Code of Conduct with emotional safety framework
+- Contribution guidelines (CONTRIBUTING.md)
+- Maintainer documentation (MAINTAINERS.md)
+
+=== Changed
+- Forked from irker to vext (Rhodium Standard Edition)
+- Modernized documentation structure
+- Enhanced security policies and procedures
+- Improved governance model
+
+=== Deprecated
+- (None yet)
+
+=== Removed
+- (None yet)
+
+=== Fixed
+- (None yet)
+
+=== Security
+- Implemented comprehensive security.txt (RFC 9116)
+- Added vulnerability disclosure process
+- Defined security review procedures
+
+== [1.0.0] - 2025-01-01
+
+=== Added
+- Initial release of vext (Rhodium Standard Edition)
+- Fork from irker with modernization focus
+- Complete documentation overhaul
+- RSR Bronze level compliance achieved
+- RSR Silver level compliance achieved
+- Community governance framework (TPCF)
+- Automated build and testing infrastructure
+- Security-first design principles
+
+=== Changed
+- Rebranded from irker to vext
+- Updated all documentation to modern standards
+- Enhanced configuration options
+- Improved error handling and logging
+
+== [0.1.0] - 2025-01-01
+
+=== Added
+- Initial fork from irker
+- Basic project structure
+- Core IRC notification functionality
+- Multi-VCS support (Git, Mercurial, SVN)
+- JSON protocol support
+- TCP and UDP communication
+- Rate limiting and flood prevention
+- Connection pooling
+- Multi-channel broadcasting
+- Color formatting support
+
+=== Technical Debt
+- Documentation needs modernization
+- Security policies need formalization
+- Build system needs standardization
+- Governance model needs definition
+
+---
+
+== Version History Summary
+
+| Version | Date       | Significance | RSR Level |
+| ------- | ---------- | ------------ | --------- |
+| 1.0.0   | 2025-01-01 | Initial release with RSR compliance | Silver |
+| 0.1.0   | 2025-01-01 | Fork from irker | None |
+
+== Release Notes Archive
+
+Detailed release notes for each version are available in `docs/releases/`:
+- [v1.0.0 Release Notes](docs/releases/v1.0.0.md)
+
+== Migration Guides
+
+=== From irker to vext
+
+See [docs/migration/FROM_IRKER.md](docs/migration/FROM_IRKER.md) for detailed migration instructions.
+
+**Quick Summary**:
+- vext is backward-compatible with irker configuration
+- No breaking changes in core functionality
+- Enhanced features are opt-in
+- Migration is primarily documentation and governance updates
+
+**Key Differences**:
+- Modernized documentation
+- Formal security policies
+- Governance framework
+- Reproducible builds
+- CI/CD automation
+
+== Compatibility Matrix
+
+| vext Version | Python Version | Supported VCS | IRC Servers |
+| ------------ | -------------- | ------------- | ----------- |
+| 1.0.0        | 3.6+           | Git, Hg, SVN  | RFC 1459    |
+| 0.1.0        | 3.6+           | Git, Hg, SVN  | RFC 1459    |
+
+== Deprecation Policy
+
+We follow a gradual deprecation process:
+
+1. **Announcement**: Feature marked as deprecated in changelog
+2. **Warning Period**: Minimum 2 minor versions or 6 months
+3. **Deprecation**: Feature issues warnings when used
+4. **Removal**: Feature removed in next major version
+
+=== Current Deprecations
+- (None)
+
+=== Planned Deprecations
+- (None)
+
+== Security Updates
+
+Security updates are released as soon as fixes are available and tested.
+
+=== Security Advisories
+
+| Date       | Severity | CVE | Description | Fixed In |
+| ---------- | -------- | --- | ----------- | -------- |
+| (None yet) | -        | -   | -           | -        |
+
+See [SECURITY.md](SECURITY.md) for vulnerability disclosure process.
+
+== Breaking Changes
+
+We avoid breaking changes whenever possible. When necessary, they are:
+- Documented in detail
+- Announced at least one major version in advance
+- Include migration guides
+- Provide backward compatibility shims when feasible
+
+=== Major Version Breaking Changes
+
+**2.0.0** (Future):
+- (None planned yet)
+
+**1.0.0**:
+- Repository rename: irker → vext
+- License change: BSD-2-Clause → MIT OR AGPL-3.0-or-later (Palimpsest)
+  - Note: Both are permissive; users can choose MIT for backward compatibility
+
+== Contribution Credits
+
+See [CONTRIBUTORS.md](CONTRIBUTORS.md) for full list of contributors.
+
+=== Major Contributors by Version
+
+**1.0.0**:
+- [Lead Maintainer] - Project lead, RSR compliance, documentation
+- [Core Developer 1] - IRC protocol, network layer
+- [Core Developer 2] - Build systems, CI/CD
+
+**0.1.0**:
+- Eric S. Raymond - Original irker author
+
+== Release Channels
+
+=== Stable
+- **Version**: 1.0.0
+- **Support**: Full support with security updates
+- **Recommended For**: Production use
+
+=== Development
+- **Branch**: `main`
+- **Stability**: May contain breaking changes
+- **Recommended For**: Testing, early adopters
+
+=== Long-Term Support (LTS)
+- **Version**: (None yet)
+- **Support**: Extended security and bug fix support
+- **Recommended For**: Enterprise deployments
+
+== Changelog Maintenance
+
+This changelog is:
+- **Updated**: With every release
+- **Format**: [Keep a Changelog](https://keepachangelog.com/)
+- **Versioning**: [Semantic Versioning](https://semver.org/)
+- **Maintained By**: Release managers (see [MAINTAINERS.md](MAINTAINERS.md))
+
+== Comparison with Upstream (irker)
+
+| Feature | irker | vext | Notes |
+| ------- | ----- | ---- | ----- |
+| Core IRC functionality | ✅ | ✅ | Fully compatible |
+| Multi-VCS support | ✅ | ✅ | Git, Hg, SVN |
+| JSON protocol | ✅ | ✅ | Identical |
+| Documentation | Basic | Comprehensive | Major improvement |
+| Security policies | Informal | Formal | RFC 9116 compliant |
+| Build system | Basic | Modern | Nix, just, CI/CD |
+| Governance | None | TPCF | Formal framework |
+| Testing | Limited | Comprehensive | Automated testing |
+| RSR compliance | None | Silver | Structured standards |
+
+== Historical Context
+
+**vext** is a modernized fork of **irker** by Eric S. Raymond:
+- **Original Project**: https://gitlab.com/esr/irker
+- **Fork Date**: 2025-01-01
+- **Fork Reason**: Active maintenance, comprehensive documentation, modern standards
+- **Compatibility**: Full backward compatibility with irker
+- **Acknowledgment**: We thank Eric S. Raymond for creating irker
+
+== Future Roadmap
+
+See [docs/roadmap/ROADMAP.md](docs/roadmap/ROADMAP.md) for detailed future plans.
+
+**Upcoming**:
+- 1.1.0: Enhanced monitoring and metrics
+- 1.2.0: Additional IRC protocol extensions (SASL, TLS)
+- 2.0.0: Architectural improvements, potential breaking changes
+
+---
+
+**Changelog Maintained By**: Release Team
+**Last Updated**: 2025-01-01
+**Format Version**: 1.0.0 (Keep a Changelog)
+
+For questions about releases, contact: release@vext.dev