chore: Enhance AI integration guidelines with runtime-specific placem…

[github-actions]

Note

The pull request "chore: Enhance AI integration guidelines with runtime-specific placem…" was created by @RulaKhaled but did not reference an issue. Therefore this issue was created for better visibility in external tools like Linear.

Enhances the AI integration guidelines with:

• Runtime-specific placement rules (Node.js, Cloudflare Workers, Browser only SDKs should stay in their respective packages)
• Mandatory auto-detection requirement for all AI integrations
• E2E testing references for Cloudflare Workers and Browser runtimes
• Attribute restriction rule (only use attributes from https://getsentry.github.io/sentry-conventions/attributes/gen_ai/)

[linear]

JS-1699