[codex] List marketplaces considered by plugin discovery

[caseychow-oai]

Summary

• List codex plugin marketplace list from the manager-backed marketplace discovery path Codex uses before plugin-level filtering.
• Include the implicit home marketplace at ~/.agents/plugins/marketplace.json, keep filtered marketplace roots visible, and print an aligned marketplace/root table.
• Fail loudly when in-scope configured or implicit marketplaces are invalid, including malformed manifests, missing local sources, and invalid configured names.
• Add CLI coverage for home discovery, filtered roots, load failures, invalid config, and table formatting.

Example

Illustrative output with sanitized marketplace roots:

$ codex plugin marketplace list
MARKETPLACE  ROOT
personal     /home/example
team         /workspace/plugins

Tests

• just fmt
• cargo test -p codex-core-plugins
• just fix -p codex-core-plugins
• Not run successfully: cargo test -p codex-cli --test plugin_cli (local webrtc-sys build fails on missing WebRTC headers)
• Not run successfully: just fix -p codex-cli (same local webrtc-sys build failure)

[chatgpt-codex-connector]

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[caseychow-oai]

/merge

[caseychow-oai]

/merge