gcp-systems-discovery overview

End-to-end GCP project/organization discovery, system attribution, GKE deep-dive (Standard + Autopilot), network/forwarding-rule attribution, external exposure map, and per-system topology diagrams. All tasks are agent-driven; there is no inter-task filesystem contract — agents self-manage working state under their task-scoped directory and pass typed results forward as JSON. The caller controls where the final reports land via `inputs.outputDir`.