Release on GitHub

Added

• Multi-PTY terminal emulator with tiling grid GUI
• gpty-core library: PTY spawning (portable-pty), ANSI parsing (vte), terminal grid (alacritty_terminal), concept pub-sub engine
• gpty-gdext GDExtension: GptyTerminal GodotClass with damage-tracked grid rendering
• gpty-cli binary: mock, --pty, and --term demo modes
• Tiling grid: split vertically/horizontally, kill, expand, and nested SplitContainer layout
• Pane types: terminal, code viewer (CodeEdit), file tree (Tree), observer
• Concept engine: regex triggers → labelled actions with {payload}/{N} variable substitution
• Concept capture: UntilStop mode buffers command output and routes to receiver panes with bidirectional handshake; prompt restoration on acknowledge
• Default concepts shipped (concepts.default.json) with enable/disable toggle and deep-merge migration from user overrides
• Settings persistence: cursor shape/blink/thickness, scroll sensitivity, default dimensions, font family/size, UI theme colors, color palette schemes - all auto-saved to user://settings.json
• Profile manager: named layout snapshots saved to user://profiles.json
• Layout auto-save/restore via user://layout.json
• Scrollback with scroll_up/scroll_down, scrollback indicator, and Ctrl+F regex search
• Wrapped text selection for copy/paste
• Toast notification system (info, warn, error) with replace-on-new behavior
• Centralized icon system (icons.gd) using Phosphor icon font
• Keyboard shortcuts: Ctrl+N (spawn), Ctrl+W (close), Ctrl+B (sidebar), Ctrl+P (command palette), Ctrl+Shift+R (reset)
• Alt+Arrow geographic pane focus navigation
• Sidebar: pane list with focus, minimize/maximize, swap, kill, and profile save/load
• Command palette with fuzzy command matching
• Title bar per pane with label prefix and action buttons
• Scrollback history stored in SQLite
• Standalone export presets (Linux, macOS, Windows) with CI release workflow
• 60 Rust tests (core + integration) and 40+ GDScript unit/integration tests