Add new-growing-products-in-category skill

[norightsforlis]

Summary

Adds the new-growing-products-in-category skill: Finds new, already-selling listings in a category (recently listed, well rated, with real sales) as a product table.

Lives in skills/new-growing-products-in-category/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.

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