fix: OptimizerV3Push3 as IOptimizer always returns bear defaults — integration risk (#1063)

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

onchain/test/OptimizerV3Push3.t.sol

@@ -103,6 +103,13 @@ contract OptimizerV3Push3Test is Test {
         assertEq(dd, BULL_DISCOVERY, "bull: discoveryDepth");
     }
 
+    // ---- getLiquidityParams() stub guard ----
+
+    function testGetLiquidityParamsReverts() public {
+        vm.expectRevert("OptimizerV3Push3: not for production use");
+        push3.getLiquidityParams();
+    }
+
     // ---- Bear cases ----
 
     function testAlwaysBearAt0Percent() public view {