chore: run vitest in the test script

fix: unit tests

feat: add -f/--fragment option to prepend file/URL/stdin content to prompts

chore: change the default model for the image command

chore: bump vercel packages

bump dependencies

bump dev dependencies

chore: format

add README and update CLAUDE.md

load the env file from the script directory

support for a default template

extract common options

refactor: extract helper functions and pretty-print structured output

remove the cmd command as it can be done with a template

switch template format from JSON to YAML