Publish harness and TUI open-source

initial sync from the monorepo

crates/codegen/xai-grok-shell/changelogs/0.2.54.md

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+# 0.2.54
+
+## Features
+
+- **Rewind** now works end-to-end across conversation and file state with proper CAS handling.
+
+## Bug Fixes
+
+- **Git branch icons** now render correctly on Windows without Nerd Fonts.
+- **Mermaid diagrams** now render inline without the model suggesting external viewers.
+- MCP connection errors now show the actual failure reason to the model.
+- MCP servers with noisy stdout no longer disconnect unexpectedly.
+- **Usage warnings** now always display "Usage left: N%" instead of varying between "Free credits left" and "Credits left".
+- **Window title** no longer flashes or oscillates during permission prompts while the terminal window is focused.
+
+## Performance
+
+- **Fixed pager freezes** and 100% CPU usage when rendering very long agent reasoning outputs with thousands of styled spans.
+