Inserts a hands-on ## Quickstart section between Secrets and Basic usage
in content/docs/google-adk.mdx. Covers workspace creation via REST API,
ready-state polling, first A2A task, multi-turn session state demo, and
Vertex AI alternative. Explains context_id → InMemorySessionService mapping
and google: model prefix stripping — gaps not covered by the reference docs.
Pairs with: Molecule-AI/molecule-monorepo#569 (docs/devrel-feat-550)
Existing docs: Docs PR #4 (google-adk.mdx reference page, already merged)
Source PR: Molecule-AI/molecule-core#550
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>