feat: Add Event tool for reporting activity to task timeline

[sestinj]

Adds the ability for agents to report activity events to the control plane:

• Add src/util/events.ts with postAgentEvent() function
• Add src/tools/event.ts with Event tool for agents
• Register Event tool in allBuiltIns.ts and index.tsx
• Event tool is only available when running in agent mode (--id flag)

Supported event types: pr_created, comment_posted, commit_pushed, issue_closed, review_submitted (and custom event names)

🤖 Generated with Claude Code

Description

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Summary by cubic

Adds an Event tool that lets agents report activity events to the task timeline. Improves visibility of actions like PRs, comments, commits, issue closures, and reviews.

• New Features
  • Event tool to post events with eventName and title (optional description, externalUrl); supports pr_created, comment_posted, commit_pushed, issue_closed, review_submitted, and custom names.
  • Utilities: postAgentEvent() to send events to the control plane, and getAgentIdFromArgs() to read the --id flag.
  • Tool is registered and only available in agent mode (requires --id).

^{Written for commit 006fab7. Summary will update automatically on new commits.}

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📚 Documentation Update

I've created PR #9341 with documentation for the new Event tool. The documentation covers:

• Tool parameters and usage examples
• Integration with the activity timeline
• Best practices for when and how to use events
• Comparison with other CLI tools (UploadArtifact, ReportFailure)

The docs follow the same pattern as the existing artifact-uploads.md documentation.