refactor: remove explanatory comment and unspecified mode guard in differ adapter

workflows/adapters/differ-adapter.ts

@@ -23,10 +23,7 @@ export function createDifferAdapter(
         throw new Error("differ: office step not found in ctx.steps (invariant violation)");
       }
 
-      const officeMeta = officeStep.meta as { mode: string; outputDocx: string; sourceDocx: string | null };
-      if (officeMeta.mode !== "edit" || officeMeta.sourceDocx === null) {
-        throw new Error("differ: office step is not in edit mode");
-      }
+      const officeMeta = officeStep.meta as { outputDocx: string; sourceDocx: string };
 
       const { outputDocx, sourceDocx } = officeMeta;
       const reportPath = join(dirname(outputDocx), "diff_report.html");
@@ -40,7 +37,6 @@ export function createDifferAdapter(
       if (!result.ok) {
         const e = result.error;
         if (e.kind === "non_zero_exit" && e.exitCode === 1) {
-          // exit 1 means "documents differ" — the normal success case for docx-diff
         } else if (e.kind === "non_zero_exit") {
           throw new Error(`differ: docx-diff failed (exit ${e.exitCode}): ${e.stderr}`);
         } else if (e.kind === "timeout") {