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## Summary Muted (NEVER mode) subgraph nodes throw "No inner node DTO found" during prompt serialization because `resolveOutput()` falls through to subgraph resolution for nodes whose inner DTOs were never registered. ## Changes - **What**: Add early return in `ExecutableNodeDTO.resolveOutput()` for `NEVER` mode nodes, matching the existing `BYPASS` mode guard. Add 5 tests covering muted, bypassed, and normal mode resolution. ## Review Focus The fix is a single-line early return. The key insight is that `graphToPrompt` in `executionUtil.ts` correctly skips `getInnerNodes()` for muted/bypassed nodes, so their inner DTOs are never in the map — but `resolveOutput()` was missing the corresponding guard for `NEVER` mode. Fixes #8986 ┆Issue is synchronized with this [Notion page](https://www.notion.so/PR-9302-fix-return-undefined-for-muted-node-output-resolution-3156d73d3650811e9697c7281f11cf96) by [Unito](https://www.unito.io)