Migrate from flake-utils to flake-parts (#21)

* refactor: migrate from flake-utils to flake-parts

- Replace flake-utils with flake-parts for better modularity
- Restructure flake.nix to use flake-parts' module system
- Keep all existing functionality intact (packages, apps, checks, etc)
- Maintain platform-specific constraints for CUDA and Docker images
- Update flake.lock with new dependencies

* docs: add CHANGELOG and improve flake.nix documentation

- Add CHANGELOG.md following Keep a Changelog format
- Add clarifying comments to flake.nix explaining cross-platform pkgs instances
- Pin nixpkgs to known-good revision (avoids test failures in newer versions)

* docs: improve flake architecture documentation

- Add comment explaining supported systems and CUDA availability
- Version CHANGELOG entry as v0.7.0-2 for flake-parts migration
- Note improved inline documentation in changelog

Author: jamesbrink

CHANGELOG.md

@@ -0,0 +1,137 @@
+# 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).
+
+## [0.7.0-2] - 2025-01-10
+
+### Changed
+- Migrated from `flake-utils` to `flake-parts` for better modularity and composability
+- Restructured `flake.nix` to use flake-parts module system with `perSystem` and `flake` attributes
+- Improved inline documentation for flake architecture
+
+## [0.7.0-1] - 2025-01-04
+
+### Added
+- `services.comfyui.cudaCapabilities` option for NixOS module to specify CUDA compute capabilities
+
+### Fixed
+- Bundle fonts and patch Comfyroll for NixOS compatibility (#18)
+
+## [0.7.0] - 2024-12-28
+
+### Changed
+- Update ComfyUI to v0.7.0 with PyTorch optimizations (#16)
+
+### Fixed
+- Disable albumentations tests to fix build issues
+
+## [0.6.0] - 2024-12-15
+
+### Added
+- InsightFace/PuLID support on macOS Apple Silicon (#14)
+- Pure Nix template input files for workflow templates
+- CUDA architecture-specific builds with unified GPU support (Pascal through Hopper)
+- Cachix push script for CI caching improvements
+- `enableManager` option in NixOS module
+- `requiresMounts` option with auto-detect home directory in NixOS module
+- CUDA support in overlay and NixOS module
+- Shellcheck to dev dependencies and flake checks
+- GitHub issue templates
+- FlakeHub publishing workflow
+
+### Changed
+- Refactored to pure Nix flake architecture (#12)
+- Switch Docker builds from buildLayeredImage to buildImage for better compatibility
+- Unify CUDA builds to use all GPU architectures in single build
+- Consolidate CI build and cache into single job
+
+### Fixed
+- Use pre-built PyAV wheels for FFmpeg 8.x compatibility
+- CPU fallback and cross-platform Docker builds
+- Skip Linux-only custom nodes on macOS
+- Make Linux-only packages conditional on platform
+- Patch rgthree-comfy for Nix store compatibility
+- Various CI improvements for CUDA builds and Cachix caching
+
+### Documentation
+- Add NixOS/nix-darwin package installation instructions
+- Add 'Why a Nix Flake?' section explaining project rationale
+- Update README with macOS platform and ComfyUI Manager integration info
+- Add AGENTS.md for AI coding assistants
+
+## [0.5.1] - 2024-11-20
+
+### Added
+- comfy-cli wrapper script for CLI access
+- Podman instructions alongside Docker
+
+### Changed
+- Update to ComfyUI v0.5.1
+
+### Fixed
+- Docker model_downloader and pip availability
+- Docker container improvements for persistence and dependencies
+- Add glib and libGL to LD_LIBRARY_PATH for OpenCV support
+- Prevent ComfyUI-Manager from updating model_downloader node
+
+## [0.4.0] - 2024-11-10
+
+### Added
+- Multi-arch Docker builds (x86_64 and aarch64) (#8)
+- Auto-download template inputs feature
+- Proper `--base-directory` support for custom data locations (#7)
+- Complete Docker support with CI/CD and public registry (#5)
+- Cross-platform Linux support
+
+### Changed
+- Modernize with ComfyUI v0.3.76 and flake improvements (#3)
+- Rename project from nix-comfyui to comfyui-nix
+- Code quality overhaul and modernization (#6)
+
+### Fixed
+- Docker container HOME environment and cross-compilation support (#10)
+- Code review security and robustness concerns (#9)
+- Replace deprecated substituteAll with replaceVars
+- Symlink verification errors on startup
+
+## [0.3.0] - 2024-10-15
+
+### Added
+- Modular script architecture for launcher
+- Model downloader with detailed progress reporting
+- Persistence for models, workflows, and generated images
+
+### Changed
+- Reorganize custom_nodes and patches into src directory structure
+- Convert launcher into modular script architecture
+
+## [0.2.0] - 2024-10-01
+
+### Added
+- ComfyUI-Manager integration
+- Python 3.12 environment with full dependency management
+
+### Fixed
+- Memory handling for SDXL models on Apple Silicon
+- Advanced model loading patches for Apple Silicon
+
+## [0.1.0] - 2024-09-15
+
+### Added
+- Initial Nix flake setup for ComfyUI
+- Python 3.12 support
+- Apple Silicon (M-series) support
+- Basic persistence for user data
+
+[0.7.0-2]: https://github.com/utensils/comfyui-nix/compare/v0.7.0-1...v0.7.0-2
+[0.7.0-1]: https://github.com/utensils/comfyui-nix/compare/v0.7.0...v0.7.0-1
+[0.7.0]: https://github.com/utensils/comfyui-nix/compare/v0.6.0...v0.7.0
+[0.6.0]: https://github.com/utensils/comfyui-nix/compare/v0.5.1...v0.6.0
+[0.5.1]: https://github.com/utensils/comfyui-nix/compare/v0.4.0...v0.5.1
+[0.4.0]: https://github.com/utensils/comfyui-nix/compare/v0.3.0...v0.4.0
+[0.3.0]: https://github.com/utensils/comfyui-nix/compare/v0.2.0...v0.3.0
+[0.2.0]: https://github.com/utensils/comfyui-nix/compare/v0.1.0...v0.2.0
+[0.1.0]: https://github.com/utensils/comfyui-nix/releases/tag/v0.1.0