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* fix(runtime): stop subgraph stream frames impersonating root frames The web frontend always requested stream_subgraphs, and since delegated subagent graphs inherit the parent checkpoint namespace (#4215), their values snapshots and token chunks ride the parent stream. The worker's _unpack_stream_item dropped the namespace and published every subgraph frame under a bare event name, so a subagent's values snapshot replaced the whole thread view in SDK clients (#4399), its token chunks flooded the parent message stream, and a subagent's LLM error fallback could be mistaken for the parent run's. Publish subgraph frames under namespace-qualified SSE event names (mode|ns1|ns2, LangGraph Platform style) and keep root-only consumers (file-tool chunk batcher, subagent event persistence, error-fallback detection) on root frames only. Drop streamSubgraphs from the frontend submit paths: subtask progress arrives via root-namespace task_* custom events, so the flag only exposed the leak. * test(runtime): add production-shaped subgraph stream regression tests Address review: the namespace tests validated the publishing helpers with hand-fed namespaces, while the #4399 regression lived in the integration between LangGraph's delegation routing and the worker's stream loop. Add TestWorkerSubgraphStreamIntegration: a real parent graph delegates through the real SubagentExecutor and streams through run_agent into a real MemoryStreamBridge, locking both stream_subgraphs modes -- delegated frames arrive namespaced (never bare), a delegated error fallback cannot mark the parent run as errored, and without the flag delegated frames stay out while task_* custom events remain.