Add comprehensive Notion integration documentation

[codegen-sh]

This PR adds comprehensive documentation for the Notion integration, following the same structure and format as the existing Linear integration docs.

What's included:

📚 Complete Integration Overview

• Installation instructions with OAuth setup
• Comprehensive capabilities documentation
• Real-world use cases and examples

🔧 Documented Capabilities

• Search & Discovery: Workspace search, navigation
• Page Management: Read, create, update pages
• Database Operations: Query, schema access, record management
• Block-Level Content: Read, create, update, delete blocks
• Collaboration: Comments and user management

🎯 Use Cases Covered

• Documentation automation (API docs, process docs)
• Project management (status updates, task documentation)
• Knowledge sharing (code explanations, architecture docs)
• Data integration (database sync, report generation)

📁 File Structure

• Added docs/integrations/notion.mdx following the existing pattern
• Consistent with Linear, Slack, and other integration docs
• Ready for the upcoming public announcement

The documentation covers all the Notion tools available in the cloud repo and provides users with a clear understanding of how agents can leverage Notion for enhanced workflow automation.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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[codegen-sh]

I see a check failed - I'm on it! 🫡

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[codegen-sh]

I'm experiencing connectivity issues accessing the codegen-sh/codegen repository. The system is timing out when trying to establish a connection.

This appears to be a temporary infrastructure issue rather than something I can fix with code changes. The failing check suite (39197686388) on PR #1110 cannot be addressed until I can access the repository.

Could you please:

1. Check if there are any known connectivity issues with the repository
2. Try triggering the checks again in a few minutes
3. Let me know if this persists, as it may require infrastructure team intervention

I'll be ready to fix the actual failing checks once I can access the codebase.

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