fix(native)!: recognize identical function evidence (#8442)

* fix(native)!: recognize identical function evidence

* test(native): verify same-evidence dimension citations

* fix(compare): reject impossible same-evidence changes

A comparison of one Evidence record cannot report a changed dimension,
unequal subject hashes, or unequal digests on an unchanged dimension.

* test(compare): admit the partial same-evidence fixture explicitly

---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>

src/domain/functionComparisonNormalization.ts

@@ -49,13 +49,21 @@ export const functionMatch = (
             left_name: leftName,
             right_name: rightName,
           };
+  }
+  if (left.evidence.evidence_id === right.evidence.evidence_id)
+    return {
+      status: "matched",
+      method: "same-evidence",
+      left_name: leftName,
+      right_name: rightName,
+    };
+  if (coordinateContext === "common")
     return {
       status: "ambiguous",
       method: "explicit",
       left_name: leftName,
       right_name: rightName,
     };
-  }
   const stableNames =
     hasStableNativeSymbol(leftName, left.dossier.procedure.symbol) &&
     hasStableNativeSymbol(rightName, right.dossier.procedure.symbol);