fix(ibkr-bot): entry-from-zero uses 0.5% floor, not full 3% hysteresis

The 3% hysteresis blocked the IBIT crypto sleeve (target 2.3% < 3%) from ever entering. Hysteresis
is for damping rebalances of existing positions; first entry from zero should use a small floor.
Now all 6 instruments deploy. Verified live against the cluster ib-gateway paper account ($1M NLV):
all 6 orders present (SPY/IEF/GLD/PDBC/DBMF/IBIT). Connected via kubectl port-forward svc/ib-gateway 4002.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

scripts/surfer/ibkr_paper_book.py

@@ -82,7 +82,9 @@ def main():
         tgt_sh = nlv * w / px[t]
         cur = pos.get(t, 0.0)
         delta = tgt_sh - cur
-        if abs(delta * px[t]) > HYST * nlv:
+        # entry from zero uses a small floor (0.5% NLV); rebalancing an existing position uses full hysteresis
+        thresh = (0.005 if cur == 0 else HYST) * nlv
+        if abs(delta * px[t]) > thresh:
             orders.append((t, "BUY" if delta > 0 else "SELL", round(abs(delta), 4)))
     print(f"\nintended orders (hysteresis {int(HYST*100)}% of NLV):")
     for t, side, qty in orders: