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- Robustify nested-Pregel detection with a parent_run_id fallback so subgraphs compiled with name equal to their node name are still recognized. - Narrow bare excepts in SubgraphTransformer close/fail paths; log at warning with exc_info instead of silently swallowing. - Assert mux registration in SubgraphTransformer._on_started instead of silently dropping events. - Warn when RemoteGraph strips an unsupported "lifecycle" stream mode so callers aren't left wondering why no events arrive. - Reject pre-built transformer instances in StreamingHandler; factories are required so transformers propagate into every subgraph scope. - Comment the forward-before-close ordering in SubgraphTransformer. - Trim duplicated pump/projection docstrings across run-stream classes. - Add end-to-end tests for trigger_call_id, subgraph interrupt, and the name-collision detection fallback.