Gru docs

Short guides for building with the public toolkit. Longer reference (full widget catalog, API notes, architecture chapters) lives in the GitHub docs/ tree next to the code.

• Cheatsheet Commands, intent index, capability matrices, gap status
• Start here Install, run hello / webviewhello, frame loop, demos
• CLI gru new, build, package
• Composition Shells, Panel / Card / ListTile, borrow rules
• Layout Height modes, scroll owner, one job per layer
• WebView WebView2 tags, FillClient, HWND host, occlusion
• Architecture Frame loop, Document, dirty flags, chapter map
• Widgets How to explore controls via demos
• Demo index 40 grudemo scenes and keyboard shortcuts
• Licensing GPLv3, contributing, security, credits