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## Why `wait_agent` can be called while mailbox mail is already pending. The previous implementation subscribed for future mailbox sequence changes and then waited for the next notification. If the mail was queued before that wait started, no new notification arrived, so the tool could sit until `timeout_ms` even though mail was ready to deliver. ## What Changed - Added `Session::has_pending_mailbox_items()` for checking pending mailbox mail through the session API. - Updated `multi_agents_v2::wait` to return immediately when pending mailbox mail already exists before sleeping on a new mailbox sequence update. - Reworked the regression coverage in `multi_agents_tests.rs` so already queued mailbox mail must wake `wait_agent` promptly. Relevant code: - [`wait_agent` pending-mail check](aa8ca06e83/codex-rs/core/src/tools/handlers/multi_agents_v2/wait.rs (L55-L60)) - [`Session::has_pending_mailbox_items`](aa8ca06e83/codex-rs/core/src/session/mod.rs (L2979-L2981)) - [`multi_agent_v2_wait_agent_returns_for_already_queued_mail`](aa8ca06e83/codex-rs/core/src/tools/handlers/multi_agents_tests.rs (L2854)) ## Verification - `cargo test -p codex-core multi_agent_v2_wait_agent_returns_for_already_queued_mail`