feat(rl): pyramiding semantics — add/partial-flat/anti-martingale sizing
Implements the full pyramid trade-management suite:
P7.a: actions_to_market_targets gates pyramid adds on ISV-driven
threshold (slot 506); rl_unit_state_update allocates sequential
unit slots on position growth, deactivates oldest on shrink.
P7.b: HalfFlat (a9/a10) closes oldest unit's lots when pyramid>1;
trail-stop routes breaches through HalfFlat + close_unit_index
override instead of nuclear full-flat.
P7.c: Anti-martingale sizing on opening actions via signed outcome EMA
(slot 508) — size_eff = base × clamp(1 + κ × ema, MIN, MAX).
Diag: pyramid { units_count, add_count, outcome_ema } in step JSONL.
ISV slots: 506 threshold, 507 add_count, 508 outcome_ema,
509 κ, 510 MIN, 511 MAX. RL_SLOTS_END → 512.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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