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99a778d63f
Implement the continuable background subagents RFC: a durable child session with a series of Task-backed activations, each disposing its run before the Task settles. - dsh-subagent: rename SubagentRun.sendMessage to strict steer, drop run-level resume, add SubagentProvider.resume dispatch via SubagentService.resume, the continuation start field, and the versioned model-hidden subagent/descriptor session event. - dsh-subagent-inprocess/-spawn/-fork: publish the control-allocated child id, append the descriptor inside the initial turn, implement cold resume from the child's own transcript under the live parent scope, and strict running-only steer. - dsh-subagent-control (new): SubagentControlService owning stable child ids, descriptor snapshot/fold/authorization, Task-backed activation with settle-then-dispose ordering, the process-local active-run association, and steer-or-resume sendMessage routing. - dsh-tool-subagent: background route branches on the provider's resume capability (continuable via the control service; one-shot task for ACP), returning both child and task ids. - dsh-tool-subagent-control (new): the globally named send_message tool rendering steered/started routes. Keyless coverage spans Task ownership and disposal ordering, running delivery, cold follow-up, descriptor rejection and rollback, known-id reconstruction, kill during lookup, admission races, and a new subagent-continuable ACP snapshot scenario.