Pure-Python orchestrator that dispatches to other android_* tools
in order, stopping on first failure. Returns a structured trace
with completed-count, per-step results, and error details.
Complements android_navigate (vision-driven) for known workflows
where the steps are deterministic and batching cuts round-trips.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
