Soul s1 retell-ack-passes-unanswered, between-sessions-read-unpinned and
poll-retell-guard-unpinned. after_echo moves the clock when the echo is
handed out, so a poll falls due while the turn runs and unanswered 1 is
pending; the old during-based test jumped before the driver read the clock.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>