Add category-opportunity-index skill

[norightsforlis]

Summary

Adds the category-opportunity-index skill: Reports a category's opportunity index plus its monthly market stats (estimated GMV, sales, sellers, listings, average ticket) with a plain-language read on how attractive it is.

Lives in skills/category-opportunity-index/SKILL.md and is registered in the README skills table. Public behavior and user-visible workflow only — no internal service names, schema, or implementation details.

Public-Safety Checklist

• No credentials, tokens, keys, or secrets.
• No internal filesystem paths.
• No private Slack, Jira, Notion, admin, or service URLs.
• No private service names or implementation details.
• No customer data or private product data.
• Skill directory name matches SKILL.md frontmatter name.

🤖 Generated with Claude Code

[profunctor]

KISS review: the new skill routes users to top-sellers, top-keywords, and category-monitor, but this public catalog/README does not include those skills yet. After installation, those handoffs can dead-end or encourage the agent to hallucinate unavailable capabilities.

Could we remove those references from the description/body, or add the referenced skills in the same release?

[profunctor]

Review — category-opportunity-index

Summary: Given one Mercado Livre (Brasil) category named in free text, reports JoomPulse's opportunity index (low/medium/high) plus current monthly stats (est. GMV, sales, active sellers, active listings, average ticket), pulls ~12 months of history for a trend line, and writes a short pt-BR interpretation with a "worth entering / enter with caution / not attractive" takeaway. Read-only, point-in-time snapshot.

Findings:

• minor — References four sibling skills that don't exist on main (top-sellers, top-keywords, gap-analysis, category-monitor). This matches existing convention (current skills already reference a nonexistent gap-analysis), so these read as aspirational hand-offs rather than literal links — but the count of dangling references is growing. Trim or align to final slugs.
• minor — The "four metric cards" (GMV, sales, sellers, average ticket) drop "active listings" relative to the 5-row indicators table. Confirm that's an intentional condensation, not an omission.
• nit — Description is long (~190 words) but on par with ml-product-analysis; triggering coverage is good and distinct from per-product skills.

No bugs, broken queries, hardcoded IDs, wrong field names, or unsafe operations; stays at the abstract "use JoomPulse" level (no leaked cube/tool names), enforces read-only, mandates the disclaimer, handles missing data with —. Structure, frontmatter, directory name == name, and README row all match. Solid and mergeable; only the dangling references are worth a comment.