docs: review and update ADK-TS Events documentation

[Demiladepy]

Summary

• Reviewed the Events documentation section against the current @iqai/adk source
• Updated Event/EventActions API references, runAsync examples, and streaming utilities
• Documented compaction and rewind action types that were missing from event-actions.mdx

Fixes #702

Test plan

• pnpm install in monorepo root
• pnpm build in apps/docs
• Preview updated pages locally with cd apps/docs && pnpm dev

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Latest commit: ad32a39

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[gemini-code-assist]

Code Review

This pull request significantly updates the documentation for the ADK-TS event system to align with recent framework changes. Key updates include the introduction of event compaction and rewind actions, a revised Event structure extending LlmResponse, and the standardization of the runner.runAsync method signature across all examples. Additionally, the documentation now features improved guidance on streaming utilities, event flow diagrams, and the logic for determining final responses. I have no feedback to provide as there were no review comments to assess.