Fix OpenAI skills-only ZIP compatibility

[TerminallyLazy]

Summary

• bump the Codex wrapper to 0.3.1
• remove the unsupported interface.screenshots field from the skills-only manifest
• remove the now-unused screenshot binaries while retaining the logo and composer icon
• add a validator regression check so screenshots cannot be reintroduced to this ZIP package

Evidence

• reproduced from the OpenAI upload validator: skills-only ZIP uploads reject interface.screenshots
• plugin-creator validation passed
• Tree Ring v0.14 runtime smoke passed
• HOL scan passed the configured 80/high gate with grade A

High-level PR Summary

This PR fixes OpenAI ZIP upload compatibility for skills-only packages by bumping the Codex wrapper version to 0.3.1, removing the unsupported interface.screenshots field from the plugin manifest, deleting the associated screenshot binaries (while keeping the logo and composer icon), and adding a validation check to prevent screenshots from being reintroduced in future releases.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	README.md
2	SUBMISSION.md
3	.codex-plugin/plugin.json
4	scripts/validate-plugin.sh
5	assets/screenshot-dashboard.png
6	assets/screenshot-evidence.png
7	assets/screenshot-recall.png

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[coderabbitai]

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Run ID: e55abfb7-3521-43e3-8ed3-174ef84287e1

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