* fix(codex): surface silent terminal activity
Successful no-output commands use a null output field, while terminal interactions carry their stdin separately. Preserve both so the agent timeline remains auditable.
* refactor(tests): share Codex event waiter
* fix(codex): preserve bounded terminal audit details
Keep terminal stdin through late command relabeling, cap it with other timeline content, and accept nullable output from legacy live completion events.
* fix(codex): preserve repeated terminal writes
