fix(tui): restore Codex harness scrolling

[senamakel]

Summary

• translate wheel input into Codex transcript cursor movement when Codex does not advertise alternate-scroll mode
• retain terminal-mode routing for other harnesses
• cover the current Codex terminal negotiation in a PTY regression test
• once the child has exited, fall back to scrolling the emulator's retained history instead of writing into a closed PTY — covered by the new an_exited_codex_session_scrolls_our_retained_history regression test

Root cause

Recent Codex CLI releases no longer emit DECSET 1007. The embedded TUI treated that mode as a prerequisite for forwarding scroll input, so Codex sessions fell back to shallow emulator history instead of scrolling their transcript. Separately, wheel input aimed at a session whose child had already exited was written into the now-closed PTY and silently lost; the scroll entry point now detects that case and diverts the wheel to the emulator's own retained history.

Validation

• cargo fmt --check
• git diff --check
• cargo test -p medulla-tui ui::harness_pane::tests::session (13 passed)
• cargo clippy --all-targets -- -D warnings

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📥 Commits

Reviewing files that changed from the base of the PR and between acb9e9d and 3c790cf.

📒 Files selected for processing (2)

• src/tui/src/ui/harness_pane/mod.rs
• src/tui/src/ui/harness_pane/tests/session.rs

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[chatgpt-codex-connector]

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[tinysweeper]

tinysweeper found nothing blocking. Approving.

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description: $0.0003 · 4,307 in  / 1,015 out · 3,833 cached (89%)  · z-ai/glm-5.2