refactor: fix exit-1 comment, remove JSON round-trip, use OfficeMeta cast

workflows/adapters/differ-adapter.ts

@@ -37,6 +37,7 @@ export function createDifferAdapter(
       if (!result.ok) {
         const e = result.error;
         if (e.kind === "non_zero_exit" && e.exitCode === 1) {
+          // docx-diff exits 1 when documents have differences — this is a success path
         } else if (e.kind === "non_zero_exit") {
           throw new Error(`differ: docx-diff failed (exit ${e.exitCode}): ${e.stderr}`);
         } else if (e.kind === "timeout") {
@@ -52,8 +53,7 @@ export function createDifferAdapter(
         throw new Error(`differ: report file not found: ${reportPath}`);
       }
 
-      const raw = JSON.stringify({ outputDocx, sourceDocx, diffReport: reportPath });
-      const meta = schema.parse(JSON.parse(raw)) as T;
+      const meta = schema.parse({ outputDocx, sourceDocx, diffReport: reportPath });
       return { meta, childThread: null };
     };
 }