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## Summary - wrap OSC 9 notifications in tmux's DCS passthrough so terminal notifications make it through tmux - use codex-terminal-detection for OSC 9 auto-selection so tmux sessions inherit the underlying client terminal support - add focused notification backend tests for plain OSC 9 and tmux-wrapped output ## Stack - base PR: #18479 - review order: #18479, then this PR ## Why Tmux does not forward OSC 9 notifications directly; the sequence has to be wrapped in tmux's DCS passthrough envelope. Codex also had local notification heuristics that could miss supported terminals when running under tmux, even though codex-terminal-detection already knows how to attribute tmux sessions to the client terminal. ## Validation - `just fmt` - `cargo test -p codex-tui` *(currently blocked by an unrelated existing compile error in `app-server/src/message_processor.rs:754` referencing `connection_id` out of scope; not caused by this change)* Co-authored-by: Codex <noreply@openai.com>