No option to disable terminal scrollback persistence (privacy gap — sensitive output saved to disk)

[arzafran]

Tracking upstream cmux manaflow-ai#6597 — applicable to our fork but needs a product/scope decision.

Assessment: Scrollback persistence exists and is called unconditionally at Sources/AppDelegate.swift:2917/2967. The toggle would be small to implement (a boolean in UserDefaults checked in Workspace.swift scrollback capture gate). However, this is a new feature/enhancement requiring a product decision on default behavior, Settings UI entry, localized string, and a config key in settings.json per the shortcut policy.

Upstream: manaflow-ai#6597

[arzafran]

Decision: Build (opt-out, default on).

Verification note: persistence is gated to graceful exit (quit/relaunch/power-off), not every keystroke — but scrollback does land on disk at quit, so the privacy concern stands.

Add a boolean (UserDefaults + settings.json key) checked at the scrollback capture gate in the graceful-exit save paths (AppDelegate.swift:2917/2967/2988); default keeps current behavior. Localized Settings toggle + documented config key. Cleared needs-decision.

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