Expand saved OMP descendants lazily while preserving exact child targets for Resume and View Log. Retain expanded branches across virtual scrolling and reject late responses/cycles. Includes the independently reviewed child-workspace correction from #20629.
61 combined target/map/nesting tests and actual OMP child/grandchild storage/CLI smoke pass. Earlier hidden Electron proof covers eight generations and narrow sidebar layout. Folder-only unresolved child targets remain disabled. No live delegation or full terminal-launch proof claimed.
Addresses #12885 Scope 2.
Neil
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