fix: apply price range filter to YES only, not NO

MIN/MAX_PRICE was filtering both YES and NO bids, blocking valid
skewed-market entries like YES=11c + NO=87c (NO fails MAX_PRICE=0.30).

Now only YES is range-checked. NO only needs basic sanity bounds (0 < noBid < 1).
This enables targeting cheap YES markets while NO bid can be any value.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.env.example

@@ -95,8 +95,10 @@ MAKER_MM_REENTRY_DELAY=30
 # Set to false to disable re-entry — bot places one order per market then waits for next
 MAKER_MM_REENTRY_ENABLED=true
 
-# Price range for maker rebate eligibility (both sides must be in range)
-# Polymarket rebates are earned on orders within ~30-70% range
+# YES bid price range — bot only enters when YES bid is within this range.
+# NO bid is derived from MAX_COMBINED - YES bid, and is NOT range-filtered.
+# Default (balanced market): 0.30-0.69 — enters near 50/50
+# Skewed market mode:        0.10-0.30 — only enters when YES is cheap (e.g. YES=11c, NO=87c)
 MAKER_MM_MIN_PRICE=0.30
 MAKER_MM_MAX_PRICE=0.69