fix(create-plugin): document valid marketplace entry fields

[abhinavgautam01]

Closes #281

Summary

• Document name and source as required marketplace plugin-entry fields.
• Document description and minClientVersions as optional fields.
• Clarify that keywords, category and tags belong in the plugin's .cursor-plugin/plugin.json manifest and are invalid in marketplace entries.

Why

The create-plugin-scaffold skill previously recommended fields that are rejected by schemas/marketplace.schema.json. Following those instructions could produce a marketplace entry that fails repository validation.

Validation

• git diff --check
• Validated SKILL.md YAML frontmatter
• Verified the documented fields match the marketplace schema
• Ran node scripts/validate-plugins.mjs
  • Result: All plugins validated successfully.

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Note

Low Risk
Documentation-only change to a scaffold skill; no runtime or schema behavior is modified.

Overview
Updates the create-plugin-scaffold skill so step 6 matches schemas/marketplace.schema.json instead of suggesting fields that fail validation.

Marketplace plugin entries are documented as requiring name and source, with optional description and minClientVersions. The skill now states that keywords, category, and tags belong in .cursor-plugin/plugin.json, not in marketplace entries.

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