feat(openapi): add Exa source presets

[mrzmyr]

Summary

• Adds Exa (search, similar links, content retrieval, answers) and Exa Websets (websets, enrichments, webhooks, monitors) as featured OpenAPI source presets
• Both presets include favicon and are marked as featured/popular

[pkg-pr-new]

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@executor/sdk

npm i https://pkg.pr.new/RhysSullivan/executor/@executor/sdk@228

@executor/plugin-file-secrets

npm i https://pkg.pr.new/RhysSullivan/executor/@executor/plugin-file-secrets@228

@executor/plugin-google-discovery

npm i https://pkg.pr.new/RhysSullivan/executor/@executor/plugin-google-discovery@228

@executor/plugin-graphql

npm i https://pkg.pr.new/RhysSullivan/executor/@executor/plugin-graphql@228

@executor/plugin-keychain

npm i https://pkg.pr.new/RhysSullivan/executor/@executor/plugin-keychain@228

@executor/plugin-mcp

npm i https://pkg.pr.new/RhysSullivan/executor/@executor/plugin-mcp@228

@executor/plugin-onepassword

npm i https://pkg.pr.new/RhysSullivan/executor/@executor/plugin-onepassword@228

@executor/plugin-openapi

npm i https://pkg.pr.new/RhysSullivan/executor/@executor/plugin-openapi@228

@executor/plugin-workos-vault

npm i https://pkg.pr.new/RhysSullivan/executor/@executor/plugin-workos-vault@228

commit: 72b175e