sell.py: fix off-by-one in queue-ahead depth

A resting order at the same price was posted first and has time
priority, so it should count as ahead too (p <= r["price"], not p <).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tools/sell.py

@@ -132,7 +132,9 @@ def main():
         cutoff_price = max(recent_prices + [best_ask or 0]) * 1.1 if recent_prices else float("inf")
         med_vol = med or 1
         for r in rows:
-            ahead = sum(u for p, u in asks if p < r["price"])
+            # p <= (not <): a resting order AT the same price was posted first and has time
+            # priority over yours - it's ahead of you too, not a free pass to the front of the queue.
+            ahead = sum(u for p, u in asks if p <= r["price"])
             # Outside the recent-traded range the queue mechanism doesn't meaningfully apply (no
             # real evidence that cumulative ahead-quantity, much of it itself unreachable junk
             # asks, clears at the normal rate) - that means "not a binding constraint" (0), NOT