- Add MANIFEST.in to include utils/ and setup/ in source distributions
- Add utils/build_all.py - unified multi-platform build orchestrator
(Linux amd64/arm64, macOS amd64/arm64, Windows amd64/arm64)
- Add BUILD_LINUX.md - Linux build guide with .deb and AppImage options
- Add RELEASE.md - complete release process with versioning (YYYY/MM.####),
platform support matrix, and release workflow
- Fix .gitignore to exclude UmbraEdit_Projects/, Inner_Demon_1.2a.docm,
UmbraEdit_deb_Build_Script.txt, requirements.txt, .DS_Store
- All source distributions now include build scripts for Linux packages
- Add BUILD_LINUX.md with instructions for building .deb and AppImage
packages on Linux AMD64 from the source distribution
- Document prerequisites, build steps, and usage for each package type
- Include source distribution (sdist) and pure Python wheel in dist/
