Add --inter-turn-think (env REPLAY_INTER_TURN_THINK_S): turn 1 fires on
session admission, each later turn a FIXED think-time after the previous
turn COMPLETES, ignoring absolute trace timestamps. Combined with
--max-inflight-sessions (env REPLAY_MAX_INFLIGHT) this is a stable N-user
closed loop, removing the open-loop "fire immediately because timestamp is
in the past" retrigger artifact. Needed for the dispatch-coupling
(wall-clock amplification) sweep.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>