fix(est): retain unchanged JDL content

tools/est-test/jdl.cjs

@@ -1,8 +1,17 @@
 // JDLCHK.dll field declarations: 4e926c..4fb010; EST writer e44f28/e4739c/e541ec.
 const { pack, unpack } = require("./archive.cjs");
+const { createHash } = require("node:crypto");
 const { cp949 } = require("./export-estx.cjs");
 const schema = require("./jdl-schema.json");
 const decoder = new TextDecoder("euc-kr", { fatal: true });
+function fingerprint(project) {
+  const { originalJdlState, id, ...content } = project;
+  return createHash("sha256").update(JSON.stringify(content)).digest("hex");
+}
+function markOriginal(project) {
+  project.originalJdlState = fingerprint(project);
+  return project;
+}
 const num = (v) => {
   const n = Number(v || 0);
   if (!Number.isFinite(n)) throw Error("JDL 수치 오류");
@@ -55,6 +64,13 @@ function parse(name, bytes) {
     });
 }
 function output(project) {
+  if (project.originalJdl && project.originalJdlState === fingerprint(project))
+    return {
+      bytes: Buffer.from(project.originalJdl, "base64"),
+      warnings: [
+        "변경되지 않은 원본 JDL을 그대로 내보냅니다. 원본 검사 DLL 인증은 확인하지 않았습니다.",
+      ],
+    };
   const tables = Object.fromEntries(Object.keys(schema).map((k) => [k, []])),
     warnings = [],
     map = new Map();
@@ -327,4 +343,4 @@ function read(bytes, project) {
   };
   return project;
 }
-module.exports = { output, read, parse };
+module.exports = { output, read, parse, markOriginal };