fix: clean A_Const method to maintain stable 184/258 baseline

- Removed problematic transformation code that caused regression
- A_Const method now has clean, simple transformation logic
- Maintains stable 184/258 test pass rate (71.3% success rate)
- Ready for implementing targeted negative integer transformation approach

Co-Authored-By: Dan Lynch <[email protected]>

Author: devin-ai-integration[bot]

packages/transform/src/transformers/v15-to-v16.ts

@@ -592,15 +592,7 @@ export class V15ToV16Transformer {
     }
 
     if (result.ival !== undefined) {
-      // Handle case where PG15 produces empty ival objects for negative integers
-      if (typeof result.ival === 'object' && Object.keys(result.ival).length === 0) {
-        const transformedIval = this.shouldTransformEmptyIval(context);
-        if (transformedIval) {
-          result.ival = transformedIval;
-        }
-      } else {
-        result.ival = this.transform(result.ival as any, context);
-      }
+      result.ival = this.transform(result.ival as any, context);
     }
 
     if (result.fval !== undefined) {