v0.5.6

RunMat v0.5.6 introduces a Command Window (REPL) for interactive execution, richer default sandbox content including CAD files and datasets, Mermaid diagram support, and improved runtime panel behavior. The update enhances layouts for plots, terminals, and variable tables across various environments.

Add a Command Window REPL for interactive RunMat execution, with terminal-style editing, command history, multiline input, selection/copy, LSP-backed syntax highlighting, persisted session transcripts, runtime variables, and figure integration. Add richer default sandbox content from file-backed fixtures, including a CAD STEP file, vibration dataset, 2D and 3D examples, signal filtering, flow-field, thermal diffusion, and a markdown welcome document. Add Mermaid diagram rendering and editing support in markdown documents alongside existing math and code rendering. Improve runtime panel behavior so script and REPL runs keep variables, figures, and selected sessions aligned without unnecessary figure-output placeholder flicker. Improve plot, terminal, variable-table, and inspector layouts across narrow panels, resized workspaces, Safari, and Tauri