P0-1: Reverse signal now bypasses cooldown - evaluate_signal always
outputs direction, main loop checks direction+score>=60 for
closing positions against trend (not blocked by COOLDOWN_MS)
P0-2: pnl_r unified to (exit-entry)/risk_distance across all exit
scenarios (tp, sl, sl_be, timeout) in both paper_monitor.py
and signal_engine.py. Old hardcoded values (1.5R/2.25R) were
~2x too high vs actual risk_distance basis.
P1-1: ensure_partitions month calculation fixed from timedelta(30d)
to proper month arithmetic. Also fixed UTC timezone for
partition boundaries.
docs: V52-TODO.md with full audit backlog for V5.2
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