Overrides closing actions (a3/a4/a9/a10) to Hold when
steps_since_done < RL_MIN_HOLD_STEPS_INDEX (slot 536, default 20).
The agent CANNOT exit before the minimum — forced to ride the wave.
Trail stops still fire regardless (safety overrides patience) —
if the market moves against the position past the trail distance,
the stop-loss exits even within the min-hold window.
Pipeline order: action selection → confidence gate → FRD gate →
min_hold_check → trail_mutate → trail_stop → heat_cap →
actions_to_market_targets
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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