Publish harness and TUI open-source

initial sync from the monorepo

crates/codegen/xai-grok-shell/changelogs/0.2.67.md

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+# 0.2.67 — 2026-06-25
+
+## Features
+
+- **Added --json-schema** flag for headless mode to constrain model output to a supplied JSON Schema.
+- **Idle detection** can now ignore background tasks when the env flag is set (off by default).
+
+## Bug Fixes
+
+- **Preview panes** no longer hibernate while actively viewed or polled.
+- **Manual /rename** now persists correctly and appears in /session-info even after auto title generation or resume.
+
+## Performance
+
+- **Find and grep** now transparently use faster bfs and ugrep binaries when present in the harness.
+