[pull] main from google:main

[pull]

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

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Summary by cubic

Promotes ADK 2.0 to GA and introduces a dedicated graph-based workflows docs section, refreshed agent/workflow guidance, and wide link fixes. Also improves Kotlin examples with a Gradle wrapper, snippet cleanups, and Android pointers.

• Docs

  • Added the new Graphs section (/graphs) with routes, data handling, human input, and dynamic workflows; updated homepage with a Graph Workflows feature and new assets.
  • Reworked workflow and agent docs (template workflows, LlmAgent, custom agents) and clarified collaboration modes.
  • Fixed and reorganized sample links across the site (moved into clearer subfolders), updated Apigee and Interactions API links, and adjusted various integration pages.
  • Added Google Cloud Skill Registry integration page.
  • Updated 2.0 landing page to GA, removed beta notices, and added Kotlin quickstart notes for Android.
  • Added redirects in mkdocs to new locations to prevent broken links.

• Examples and Tooling

  • Kotlin examples: added Gradle wrapper, updated ktlint settings, simplified build config, and added .gitignore.
  • Kotlin snippets: moved from Map returns to typed data classes, formatting fixes, and minor API usage cleanups.
  • Snippet runner now prefers the Gradle wrapper; minor ignore and lychee checks updated.

^{Written for commit 6a93592. Summary will update on new commits. Review in cubic}