[pull] main from google:main

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Created by pull[bot] (v2.0.0-alpha.4)

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Summary by cubic

Unifies product names across docs (Agent Runtime, Knowledge Engine), updates examples to use gemini-flash-latest, and fixes TypeScript snippet rendering. Adds redirects for renamed pages and makes small copy clarifications.

• Refactors

  • Renamed “Agent Engine” to “Agent Runtime” and “RAG Engine” to “Knowledge Engine” throughout docs.
  • Updated grounding docs to reference Agent Retrieval and Knowledge Engine.
  • Renamed RAG Engine integration to Knowledge Engine; added mkdocs redirects.
  • Switched all integration examples to gemini-flash-latest.

• Bug Fixes

  • Replaced TypeScript snippet markers with mkdocs include tags for proper rendering in @google/adk snippets.
  • Clarified RequestInput wording so it doesn’t imply @node is required.
  • Minor copy fixes (e.g., cleanup steps now say “delete the Agent Runtime instance”).

^{Written for commit 5b7e2dd. Summary will update on new commits. Review in cubic}