Define or update the author visual style guide: $ARGUMENTS

$ARGUMENTS should include:

create — Create a new author style guide from reference photos
update — Update an existing style guide with new preferences
show — Display the current style guide
apply [image-path] — Check if an image matches the style guide
Optionally: reference image paths showing the "look" the user wants
Optionally: verbal description of desired aesthetic
Empty — check if a guide exists; if not, start creation

Purpose

This skill creates a single source of truth — the Author Style Guide — stored at {{ASSET_DOCS_DIR}}/author-style-guide.md. Every other asset skill (/asset-headshot, /asset-hero-portrait, /asset-generate, etc.) checks for this file and follows it to ensure visual consistency across all author imagery.