A program's package name can differ from the console script it exposes
(litellm-intent-router installs the 'intent-router' executable), so the
which(<program>) install-check missed it: the tool installed fine but castle kept
reporting 'not installed', making the Install button look dead. _on_path now also
consults 'uv tool list' by package name (2s-cached), and the API's install-checks
use the shared tool_installed() helper. Verified litellm-intent-router now reads
installed/active True.
Paul Payne
bcd040edfd