Client.wait_for_text

Subscribe and capture the screen immediately, then recapture on output. Membership/overflow gaps establish fresh coverage in the same binding. Maximum pattern: 64 KiB. Return captured rendered text containing it; transient text may be missed. Deadlines are checked between bounded acquisitions, whose I/O retains the client exchange timeout. Cancellation propagates and releases the subscription. A cleanup failure cannot replace an earlier error or cancellation; inspect cleanup for secondary failures. Otherwise cleanup failure prevents success or renewed coverage. No history/barrier guarantee.