feat: clean spawn v1

[jif-oai]

Avoid the usage of path in the v1 spawn

[jif-oai]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

codex/codex-rs/core/src/tools/handlers/multi_agents/wait.rs

Lines 50 to 54 in 3cd0780

	agent_metadata
	.agent_path
	.as_ref()
	.map(ToString::to_string)
	.unwrap_or_else(|| receiver_thread_id.to_string()),

Key wait_agent v1 results by thread ID

Keep v1 wait_agent output keys as IDs. After this change, v1 send_input/close_agent accept only agent IDs and the v1 schema documents ID-keyed statuses, but WaitAgentHandler still prefers agent_metadata.agent_path. If a target has a path (e.g. legacy/named metadata), the model gets /root/... keys and follow-up v1 calls fail with invalid agent id.

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