[codex] Package Wix and Base44 plugins

[moustafa-openai]

Summary

• Carries forward the Wix and Base44 plugin packaging work from [codex] Package Wix and Base44 plugins #297 onto a fresh dev/moustafa/wix-base44-pr-297 branch.
• Registers Wix and Base44 as available Developer Tools plugins in the marketplace.
• Adds the Wix and Base44 connector manifests and normalizes plugin metadata so both plugins are discoverable through .codex-plugin/plugin.json, .app.json, and skill agents/openai.yaml files.

Validation

• Parsed .agents/plugins/marketplace.json, plugins/wix/.codex-plugin/plugin.json, and plugins/base44/.codex-plugin/plugin.json with jq.
• Parsed the added agents/openai.yaml files with Ruby YAML.
• Parsed plugins/wix/.app.json and plugins/base44/.app.json with jq.
• Confirmed marketplace entries resolve to ./plugins/wix and ./plugins/base44 with AVAILABLE / ON_INSTALL policy.
• No additional code changes were made while copying the branch from the source PR.

Source PR

This is a fresh-branch copy of #297 by @ashwinm-oai so the same Wix/Base44 changes can be reviewed and merged into main from dev/moustafa/wix-base44-pr-297.

[ashwinm-oai]

LGTM