susu v0.1.0

Changelog

• a93babb build: add Makefile for minimal builds and installation
• 1e31c88 ci: add automated GitHub releases with GoReleaser
• b4cd131 docs(design): document architecture and data flows
• 0b31c71 docs(readme): streamline overview and integrate project lore
• 95496e2 docs(reference): add detailed CLI and behavior reference
• 61f7b51 docs(security): document security model and cryptographic formats
• 836c520 feat(app): implement dotfile management workflows
• aa37f13 feat(cli): expose susu command-line interface
• 885a2d6 feat(crypto): add repository master-key encryption
• da4d828 feat(manifest): add versioned repository manifest
• f10f406 feat(paths): add portable HOME and XDG path resolution
• 7f18659 feat(repository): add Git repository management and locking
• 28f1144 feat(safefs): add symlink-safe filesystem operations
• fb6036f feat(state): persist active repository binding