Widens the new hook to the sibling interrupt surface: the TUI/desktop
session.interrupt path stops a live turn exactly like the gateway's
/stop, so plugins holding per-turn external resources get the same
signal there (platform='tui'). Gated on a genuinely running turn;
dispatch failures are swallowed so a plugin can never break the
interrupt. Docs updated to describe both surfaces.
Inspired by ChatGPT Work / Codex CLI 0.150.0 'Interrupt' hooks
(hooks that run when an active top-level turn is interrupted).
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