Publish harness and TUI open-source

initial sync from the monorepo

crates/codegen/xai-grok-shell/changelogs/0.2.50.md

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+# 0.2.50
+
+## Features
+
+- **Mermaid flowcharts** now render edge crossings clearly instead of fusing unrelated connections.
+
+## Bug Fixes
+
+- **Sequence diagrams** with activate, autonumber, par, and more now render instead of showing parse errors.
+- **MCP servers menu** and slash commands now work when starting grok outside a project directory.
+- **Ctrl+W** in the prompt now deletes whole words like bash instead of stopping at punctuation.
+- **Login** no longer quits when an authentication code contains the letter q.
+