[id774]

Summary

• clarify that Docker is an operating-system-level prerequisite and is not installed by npm
• document the required Docker Engine, CLI, Compose v2, and daemon-access checks
• explain the difference between missing Docker CLI, missing Compose v2, and unavailable daemon access
• keep the local demo implementation and runtime behavior unchanged

Validation

• confirmed the documented checks match the existing local-demo preflight
• confirmed README, getting-started, and development guidance use one consistent Docker prerequisite model
• confirmed npm package metadata and the lockfile are unchanged
• confirmed source, tests, policy, and version history are unchanged
• npm run format:check
• git diff --check

Version

• repository version remains v1.0 dated 2026-10-03
• doc/VERSIONS remains unchanged
• no Git tag or GitHub Release is created

Scope

Documentation-only clarification of the Docker prerequisites for the local-first path.
No runtime, dependency, package, test, policy, version, tag, or release change is included.