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## Summary This is the first small step toward making multi-agent v2 agents durable logical agents whose `ThreadManager` residency is only an implementation detail. This PR adds a narrow v2 reload-on-delivery hook: - If a known v2 agent target is already loaded, delivery is unchanged. - If the target is still registered but missing from `ThreadManager`, delivery reloads that exact v2 thread from durable rollout history before submitting the message. - If the target is unknown, closed, missing from storage, or not a v2 thread, delivery still fails as not found. The reload is wired only into existing-agent delivery paths: v2 `send_message` / `followup_task`, and legacy `send_input` when its target is a known v2 agent. ## Stack 1. **Reload on delivery**: load known unloaded v2 agents before `followup_task`, `send_message`, or `send_input` delivery. This PR. 2. **Residency LRU**: unload idle resident v2 agents from `ThreadManager` without making them closed or unreachable. 3. **Execution concurrency**: count active non-root turns, not logical agents or resident idle threads. 4. **Close semantics**: make v2 close interrupt-only and leave durable agent identity intact. 5. **Resume cleanup**: remove user-facing v2 resume semantics; addressing an unloaded durable agent reloads it implicitly. ## Validation - Ran `just fmt`. - Left broader tests and clippy to CI.
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