house: add multi-platform build infrastructure
- 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
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