Writes .claude/skills/linea-ui/: a short SKILL.md index and one reference per component,
generated from the components' attrs, slots and docs.
mix linea_ui.gen.skill
mix linea_ui.gen.skill --path priv/skills/linea-uiFiles of a previous run are replaced, and references of components that no longer exist are removed, so running it after an upgrade keeps the skill exact.