Updated ChzEx.Schema.chz?/1 to call Code.ensure_loaded?/1 before verifying
function exports. This ensures the function handles unloaded modules
gracefully without raising errors.

The project version has been bumped to 0.1.3 in both mix.exs and README.md.
Documentation configuration in mix.exs now includes the homepage_url. The
CHANGELOG has been updated to reflect these functional improvements.

The project logo in assets/chz_ex.svg was redesigned with optimized
paths, updated gradients, and enhanced visual filters for a more
cinematic appearance. Additionally, minor cleanup was performed on
AGENTS.md to remove trailing whitespace.

This version is ready for publication to Hex.