Publish harness and TUI open-source

initial sync from the monorepo

crates/codegen/xai-grok-shell/changelogs/0.2.12.md

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+# 0.2.12
+
+## Features
+
+- **Computer connection status** now shows a connecting pill during terminal session initialization.
+- **/check** and subagents now read and follow full AGENTS.md rules from the repo.
+
+## Bug Fixes
+
+- **--max-turns** now correctly counts tool-use cycles instead of total messages.
+- **@-mention file search** now works again for local agent sessions.
+- **Rendered images, files, and citations** now replay correctly in chunk-mode history.
+- **`/context`** now displays the correct auto-compact threshold for the active model instead of always 85%.
+- **Model responses** are no longer silently dropped when the gateway emits legacy channel values.
+- **Prompt responses** no longer resolve before the turn's final output chunks reach the client.
+