tests: release screen-rule turns explicitly instead of sleeping

Two screen tests showed a working line for a fixed two seconds; under the
full verification load the 500 ms classification tick could miss it
(seen in verify.sh full). The fake agents now wait for a release file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
e7672bb963Lucenx9 committed on 10/9/2026, 6:40:02 PMparentd502bf3

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