riotpiao.com/tasks/2.4-api-topology.md

2.4 — GET /api/topology (GREEN)

Phase: 2 — Topology (Surface B) Stage: GREEN

Depends on: 1.7

• GET /api/topology — nodes, namespaces, workload summaries; envelope {"data": {}, "meta": {"snapshotAge", "generation"}}; capped 256 KB, meta.truncated: true on overflow, never a silent drop