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## Why The v1 sub-agent tools are a single tool family, but they were exposed as separate flat function tools. This makes the model-visible surface less clearly grouped and leaves the legacy names in the same flat namespace as newer agent tooling. ## What - Wraps the v1 `spawn_agent`, `send_input`, `resume_agent`, `wait_agent`, and `close_agent` specs in the `multi_agent_v1` namespace. - Registers the corresponding handlers with namespaced runtime tool names. - Updates tool-planning, deferred tool search, and sub-agent notification tests to assert the namespace shape and child `spawn_agent` lookup. ## Verification - Updated `codex-core` coverage for the v1 multi-agent tool plan, deferred tool search output, and sub-agent tool descriptions.