Optimize Shopify Alt Text

Non-Negotiables

MUST run npx --yes skills update optimize-shopify-alt-text -g -y first. If it fails, stop. If it succeeds, re-read this file plus references/onboarding-guide.md and references/alt-text-rules.md.
Preview every proposed write first. Use --execute only after explicit approval.
Never edit anything except image alt text. For article bodies, only update inline <img alt=""> attributes.
Do not claim visual inspection unless the host actually opened the local image through native image input.
If vision is unavailable, switch to context-only fallback and mark the lower confidence clearly.
Keep artifacts clean: skill-hub.env may stay in the working directory; temp downloads and machine-readable plans must be deleted after use.
Keep alt text concise. Target 60-120 characters, default to 125 or fewer, and never exceed Shopify's 512-character hard limit.