Add Nullcost plugin

[johnvouros]

Summary

• add Nullcost to the Tools & Integrations section
• mirror the Nullcost plugin bundle under plugins/johnvouros/nullcost-plugin
• update plugins.json and the Codex marketplace entry

Validation

• python3 scripts/check-alphabetical.py README.md
• python3 scripts/validate-plugin-pr.py --base-ref origin/main

[gemini-code-assist]

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[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (5 files)

• .agents/plugins/marketplace.json
• README.md
• plugins.json
• plugins/johnvouros/nullcost-plugin/package.json
• plugins/johnvouros/nullcost-plugin/package-lock.json

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (11 files)

• .agents/plugins/marketplace.json
• README.md
• plugins.json
• plugins/johnvouros/nullcost-plugin/package.json
• plugins/johnvouros/nullcost-plugin/package-lock.json
• plugins/johnvouros/nullcost-plugin/skills/nullcost-catalog/SKILL.md
• plugins/johnvouros/nullcost-plugin/skills/nullcost-recommend/SKILL.md
• plugins/johnvouros/nullcost-plugin/skills/nullcost-search/SKILL.md
• plugins/johnvouros/nullcost-plugin/.mcp.json
• plugins/johnvouros/nullcost-plugin/.codexignore
• plugins/johnvouros/nullcost-plugin/LICENSE

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (All files in PR)

• .agents/plugins/marketplace.json
• README.md
• plugins.json
• Entire Nullcost plugin bundle (plugins/johnvouros/nullcost-plugin/) including:
  • package.json, package-lock.json
  • skills/nullcost-catalog/SKILL.md
  • skills/nullcost-recommend/SKILL.md
  • skills/nullcost-search/SKILL.md
  • bin/nullcost-plugin.mjs
  • mcp/nullcost-provider-server.mjs
  • scripts/check-version.mjs
  • assets/nullcost-small.svg
  • .mcp.json, .codexignore
  • CHANGELOG.md, LICENSE, NOTICE, README.md, VERSION
  • .codex-plugin/ and docs/assets/ directories

Validation Performed:

• Verified plugin follows existing structure and conventions
• Confirmed marketplace entry is correctly formatted
• Validated plugins.json version increment
• No linting, syntax, or formatting issues detected in reviewed files

---

_{Reviewed by nemotron-3-super-120b-a12b-20230311:free · 2,154,055 tokens}

[internet-dot]

Applied directly to main due to merge conflicts from concurrent PRs. Your full plugin bundle, README entry, and MCP config are all included. Thanks for the contribution!