Carve the direct-child list reconciliation from Indigo Karasu's earliest
PR #60506 (2a96ae2cbf806ccdc3e9b584911774f32622f421), corroborated by
fangliquanflq's narrow #81385 (50ffd243d92627e4a03a3ee8427ad0f5e090c3ab).
Run the existing helper after task/session filtering and reuse the
idempotent owner-stamped completion path. Do not import cross-session
disclosure, bare-PID healing, forget RPCs, or reader rewrites.
A real-child regression fails before this change and passes after it:
the direct child exits while its descendant keeps writing to stdout;
listing reports exit without consuming the result or waiting for EOF.
Co-authored-by: fangliquanflq <fangliquan@qq.com>
Co-authored-by: Teknium <127238744+teknium1@users.noreply.github.com>
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