diff --git a/A00_Common/design/design_profile.ts b/A00_Common/design/design_profile.ts
index f49124127..ef5f75fbe 100644
--- a/A00_Common/design/design_profile.ts
+++ b/A00_Common/design/design_profile.ts
@@ -406,7 +406,7 @@ export function createDesignProfile(ctx: DesignProfileContext) {
   function draw(): void {
     renderProfile({
       // 그린 뒤 생긴 낡음도 다시 셈(317-1) · 노선 초안 동안은 묶음 cross 를 기다림
-      onStaleDesigns: (key) => (store === preview ? key !== "" : crossPreview.scheduleIfStale(key)),
+      onStaleDesigns: (key) => crossPreview.scheduleIfStale(key, store === preview),
       body,
       callbacks,
       massHaul,
diff --git a/B05_Profile/B05_Profile_UI_Profile_Preview.ts b/B05_Profile/B05_Profile_UI_Profile_Preview.ts
index 5457feaf6..e45450ddb 100644
--- a/B05_Profile/B05_Profile_UI_Profile_Preview.ts
+++ b/B05_Profile/B05_Profile_UI_Profile_Preview.ts
@@ -7,12 +7,22 @@
  * 3D 예상형상이 같은 값으로 따라온다(2026-08-03·08-23 사용자 보고).
  *
  * 끌기 중에는 계속 호출되므로 디바운스하고, 늦게 온 응답은 seq 비교로 버린다.
+ * 노선 초안 동안은 서버에 안 물음 — 계산 묶음 cross 가 그 차례를 끝낼 때까지만 「다시 계산 중」 · 그 뒤 남은
+ * 낡음은 곡선을 그리고 그 측점만 표시(342-1 · 349-0f).
  * ========================================================================== */
 
 import type { AlignmentEdits, ProfileAlignment } from "./logic/B05_Profile_UI_Profile_Alignment";
 import { holdScreenAlignment, refreshCrossDesigns } from "../B06_Section/B06_Section_Cross_Refresh";
 import { staleChainages } from "../B06_Section/B06_Section_UI_Section_Common";
 import type { SectionDetailResponse } from "../B06_Section/B06_Section_Api_Fetch";
+import { pagePipeline } from "../A00_Common/design/design_pipeline_page";
+import { useDesignStore } from "../A00_Common/design/design_store";
+import type { DesignPipeline, PipelineEvent } from "../A00_Common/design/logic/design_pipeline";
+
+/** cross 를 지났다고 볼 단계(cross 가 같은 입력이라 건너뛰어도 뒤 단계가 알림). */
+const AFTER_CROSS = new Set(["cross", "footprint", "masshaul"]);
+/** 묶음 차례가 cross 를 못 낸 채 끝나도(단계 실패) 「다시 계산 중」을 푸는 때(ms). */
+const DRAFT_WAIT_MS = 3000;
 
 export interface CrossPreviewContext {
   projectId: string;
@@ -34,8 +44,9 @@ export interface CrossPreview {
    * 그리기가 잰 낡음 지문 — 새 지문일 때만 `schedule`(같은 낡음 되풀이 · 서버 폴백 반복 막음 · 317-1).
    * 돌려주는 값 = 다시 셈을 기다리는 중인가. 다시 셈 뒤에도 남은 낡음은 false — 곡선은 그리고
    * 그 측점만 표시(342-1 · 09-03 「새 값만 보여주기」를 바꿈 · 사용자 확정 10-16).
+   * `draft` = 노선 초안 동안 — 서버에 안 묻고 묶음 cross 차례만 기다림(349-0f).
    */
-  scheduleIfStale: (key: string) => boolean;
+  scheduleIfStale: (key: string, draft?: boolean) => boolean;
   /** 패널을 걷을 때 대기 중인 요청 타이머를 끈다. */
   dispose: () => void;
 }
@@ -51,16 +62,43 @@ export function createCrossPreview(ctx: CrossPreviewContext): CrossPreview {
     routeId === ctx.routeId() ? ctx.alignment() : null,
   );
 
+  /** 노선 초안 동안 기다리는 묶음 차례 — 그 차례 cross(또는 뒤 단계)가 오면 풂. */
+  let awaiting: number | null = null;
+  let waitTimer = 0;
+  let watched: DesignPipeline | null = null;
+  const onStage = (event: PipelineEvent): void => {
+    if (event.kind === "stage" && event.generation === awaiting && AFTER_CROSS.has(event.stage))
+      awaiting = null;
+  };
+  const stopGeneration = useDesignStore(ctx.projectId, null).subscribe("generation", (gen) => {
+    const pipe = pagePipeline(ctx.projectId);
+    if (!pipe || gen === null) return;
+    if (watched !== pipe) (watched = pipe).subscribe(onStage);
+    awaiting = gen;
+    window.clearTimeout(waitTimer);
+    waitTimer = window.setTimeout(() => {
+      if (awaiting !== gen) return;
+      awaiting = null;
+      ctx.onApplied([]);
+    }, DRAFT_WAIT_MS);
+  });
+  const warnLeft = (key: string): void => {
+    if (!key || key === warned) return;
+    warned = key;
+    console.warn(
+      `[횡단] 다시 셈 뒤에도 낡은 측점 ${staleChainages(key).length}곳 — 곡선은 그리고 그 측점만 표시`,
+      staleChainages(key),
+    );
+  };
+
   const preview: CrossPreview = {
-    scheduleIfStale(key) {
-      if (key && key !== lastStale) preview.schedule();
-      else if (key && !busy && key !== warned) {
-        warned = key;
-        console.warn(
-          `[횡단] 다시 셈 뒤에도 낡은 측점 ${staleChainages(key).length}곳 — 곡선은 그리고 그 측점만 표시`,
-          staleChainages(key),
-        );
+    scheduleIfStale(key, draft = false) {
+      if (draft) {
+        if (awaiting === null) warnLeft(key);
+        return key !== "" && awaiting !== null;
       }
+      if (key && key !== lastStale) preview.schedule();
+      else if (!busy) warnLeft(key);
       lastStale = key;
       return key !== "" && busy;
     },
@@ -101,6 +139,8 @@ export function createCrossPreview(ctx: CrossPreviewContext): CrossPreview {
     },
     dispose() {
       window.clearTimeout(timer);
+      window.clearTimeout(waitTimer);
+      stopGeneration();
       release();
     },
   };
diff --git a/B06_Section/logic/B06_Section_Cross_Stage.ts b/B06_Section/logic/B06_Section_Cross_Stage.ts
index e350e2d47..efb4b4839 100644
--- a/B06_Section/logic/B06_Section_Cross_Stage.ts
+++ b/B06_Section/logic/B06_Section_Cross_Stage.ts
@@ -5,7 +5,8 @@
  *
  *   · 계산 = `computeCrossDesign`(파이썬 `B06_Section_Engine_Design.py` 짝 · Cross_Refresh 와 같은 엔진).
  *   · 국부 연산 = 측점 열쇠마다 입력 지문(지반 표본 · 계획고 · 횡단 입력 · 확폭 · 표준값) — 같으면 앞 결과 그대로.
- *   · 바뀐 범위(`ctx.range`) 밖이고 앞 출력(`ctx.prev`)에 있으면 셈 없이 재사용.
+ *   · 바뀐 범위(`ctx.range`) 밖이고 앞 출력(`ctx.prev`)에 있고 계획고가 그대로면 셈 없이 재사용 — 노선 초안의
+ *     첫 계획선은 바뀐 구간 앞 꼭짓점까지 움직이므로 범위만 보면 낡은 설계가 남음(349-0f).
  *   · 단계는 자기 출력만 돌려줌(입력 · 앞 단계 출력은 읽기만). DOM · fetch · 세션 없음.
  * input.cross 모양 = `CrossStageInput`(부르는 쪽이 세션 선택 · 저장분 · 구조물 맥락을 측점 열쇠로 모아 넘김).
  * ========================================================================== */
@@ -59,6 +60,13 @@ const inRange = (station: PipelineStation, ctx: StageContext<"cross">): boolean
   return station.chainageM >= range.fromM - 1e-6 && station.chainageM <= range.toM + 1e-6;
 };
 
+/** 앞 결과가 같은 자리 · 같은 계획고(엔진이 0.1 mm 로 반올림)인가 — 다르면(노면 하강 등) 지문 기억이 맡음. */
+const sameSpot = (kept: CrossStationResult, station: PipelineStation, elevation: number): boolean =>
+  Math.abs(kept.chainageM - station.chainageM) < 1e-6 &&
+  Math.abs(
+    Number((kept.detail as { design_elevation_m?: number } | null)?.design_elevation_m) - elevation,
+  ) <= 1e-4;
+
 /**
  * `cross` 단계 만들기 — 측점 지문 기억은 이 단계 함수가 사는 동안. `counts()` = 마지막 계산의 다시 셈 · 재사용 수.
  */
@@ -76,13 +84,13 @@ export function createCrossStage() {
     last = { computed: 0, reused: 0 };
     for (const station of ground.stations) {
       const kept = ctx.prev?.byKey[station.key];
-      if (kept && !inRange(station, ctx)) {
+      const elevation = planElevationAt(profile, station.chainageM);
+      if (kept && !inRange(station, ctx) && sameSpot(kept, station, elevation)) {
         byKey[station.key] = { ...kept, chainageM: station.chainageM };
         last.reused += 1;
         continue;
       }
       const samples = groundSamples(station);
-      const elevation = planElevationAt(profile, station.chainageM);
       const options = optionsFor(station, input.byKey[station.key], input.standard);
       const fingerprint = `${standardKey}|${elevation}|${JSON.stringify(samples)}|${JSON.stringify({ ...options, standard: null })}`;
       const hit = memo.get(station.key);
diff --git a/resources/tester/helper_349_0f_draft_stale.cjs b/resources/tester/helper_349_0f_draft_stale.cjs
new file mode 100644
index 000000000..ac6197ebe
--- /dev/null
+++ b/resources/tester/helper_349_0f_draft_stale.cjs
@@ -0,0 +1,285 @@
+/* PLAN 349-0f 헬퍼 — 노선 초안 두 번 끌기(길이 바뀜 + 가운데 꺾임점) 뒤 새 노선 횡단 낡음 · 「다시 계산 중」.
+ * 진짜 TS(`design_pipeline_page` · 단계 파일 · `B05_Profile_UI_Profile_Preview`)를 트랜스파일해 Node 로 돌림.
+ * 서버 창구만 가짜(틀 = `helper_346_2_pipeline_cross_page.cjs` 그대로). 입력 argv[2] JSON · argv[3] 격자 이진.
+ * 결과 = 표준출력 JSON. 짝 = `test_349_0f_draft_stale.py`. */
+const fs = require("fs");
+const path = require("path");
+const ts = require(path.join(__dirname, "..", "..", "config", "node_modules", "typescript"));
+const CATALOG = require("./helper_322_catalog_module.cjs");
+
+const ROOT = path.join(__dirname, "..", "..");
+const job = JSON.parse(fs.readFileSync(process.argv[2], "utf8"));
+
+function memoryStorage() {
+  const map = new Map();
+  return {
+    getItem: (key) => (map.has(key) ? map.get(key) : null),
+    setItem: (key, value) => map.set(key, String(value)),
+    removeItem: (key) => map.delete(key),
+    key: (index) => [...map.keys()][index] ?? null,
+    get length() {
+      return map.size;
+    },
+  };
+}
+globalThis.window = {
+  sessionStorage: memoryStorage(),
+  localStorage: memoryStorage(),
+  setTimeout,
+  clearTimeout,
+};
+
+// 흙 배분 서버 — 늦게 답함 · 끊기면 버림
+const haul = { calls: 0, aborted: 0, answered: 0 };
+globalThis.fetch = (url, init) =>
+  new Promise((resolve, reject) => {
+    haul.calls += 1;
+    const timer = setTimeout(() => {
+      haul.answered += 1;
+      resolve({ ok: true, json: async () => ({ haul_plan: { blocks: [], url } }) });
+    }, job.haulDelayMs);
+    init.signal.addEventListener("abort", () => {
+      clearTimeout(timer);
+      haul.aborted += 1;
+      reject(new Error("aborted"));
+    });
+  });
+
+const STUBS = {};
+const cache = new Map();
+function loadTs(full) {
+  if (cache.has(full)) return cache.get(full);
+  const js = ts.transpileModule(fs.readFileSync(full, "utf8"), {
+    compilerOptions: { module: ts.ModuleKind.CommonJS, target: ts.ScriptTarget.ES2020 },
+  }).outputText;
+  const box = { exports: {} };
+  cache.set(full, box.exports);
+  const localRequire = (request) => {
+    if (CATALOG.isCatalogRequest(request)) return CATALOG;
+    const key = Object.keys(STUBS).find((name) => request.endsWith(name));
+    if (key) return STUBS[key];
+    if (request.startsWith("@config/")) return { API_BASE_URL: "http://fake" };
+    if (request.startsWith("@util/"))
+      return loadTs(path.join(ROOT, "common_util", `${request.slice(6)}.ts`));
+    if (request.startsWith(".")) return loadTs(path.join(path.dirname(full), `${request}.ts`));
+    return require(request);
+  };
+  new Function("exports", "module", "require", js)(box.exports, box, localRequire);
+  return box.exports;
+}
+const load = (...parts) => loadTs(path.join(ROOT, ...parts));
+
+const sampler = load("common_util", "common_util_surface_sampler.ts");
+const bytes = fs.readFileSync(process.argv[3]);
+const grid = sampler.parseDtmGrid(
+  bytes.buffer.slice(bytes.byteOffset, bytes.byteOffset + bytes.length),
+);
+const local = { grid, design: "las" };
+
+STUBS["B05_Profile_Api_Replan"] = {
+  analysisTerrain: () => "las",
+  fetchRoutePlan: async () => ({
+    planned: job.line,
+    curves: [],
+    min_radius_m: job.minRadius,
+    station_snap: false,
+  }),
+};
+STUBS["B05_Profile_Api_Structures"] = {
+  fetchStructures: async () => ({ structures: [] }),
+  fetchStructureTypes: async () => job.types,
+};
+STUBS["B05_Profile_Api_TerrainGrid"] = {
+  loadDesignTerrainGrid: async () => local,
+  groundStageDeps: () => ({ grid: () => local, remote: async () => [] }),
+};
+STUBS["B04_PreProcess_Api_Fetch"] = {
+  fetchDetailPipePoints: async () => ({
+    pipe_points: job.pipes.map((pipe) => ({ ...pipe, lonlat: [0, 0] })),
+  }),
+};
+STUBS["B06_Section_UI_Standard_Panel"] = { effectiveStandardCross: () => job.standard };
+STUBS["B06_Section_Cross_Refresh"] = {
+  holdScreenAlignment: () => () => undefined,
+  refreshCrossDesigns: async () => [],
+};
+STUBS["B06_Section_UI_Section_Common"] = {
+  staleChainages: (key) => (key ? key.split("|").map((entry) => Number(entry.split(":")[0])) : []),
+};
+
+const pipeMod = load("A00_Common", "design", "logic", "design_pipeline.ts");
+const pageMod = load("A00_Common", "design", "design_pipeline_page.ts");
+const stationsMod = load("A00_Common", "design", "logic", "design_pipeline_stations.ts");
+const routeGround = load("B05_Profile", "logic", "B05_Profile_Pipeline_RouteGround.ts");
+const grade = load("B05_Profile", "logic", "B05_Profile_Pipeline_Grade.ts");
+const gradeGround = load("B05_Profile", "logic", "B05_Profile_Grade_Ground.ts");
+const detailMod = load("B05_Profile", "logic", "B05_Profile_Pipeline_Detail.ts");
+const alignment = load("B05_Profile", "logic", "B05_Profile_UI_Profile_Alignment.ts");
+const editMod = load("B05_Profile", "B05_Profile_UI_Profile_Edit.ts");
+const page = load("A00_Common", "b_page_state.ts");
+const storeMod = load("A00_Common", "design", "design_store.ts");
+const previewMod = load("B05_Profile", "B05_Profile_UI_Profile_Preview.ts");
+
+const tick = (ms = 0) => new Promise((resolve) => setTimeout(resolve, ms));
+const runs = () => globalThis.__aisloPipeline?.runs ?? [];
+async function settle(count) {
+  for (let i = 0; i < 400; i += 1) {
+    const last = runs()[runs().length - 1];
+    if (runs().length >= count && last && last.outcome !== "running") return last;
+    await tick(5);
+  }
+  throw new Error("묶음이 끝나지 않음");
+}
+const n = job.nodes.length;
+const draftOf = (nodes) => ({
+  nodes,
+  curveOn: Array(n).fill(true),
+  curveRadius: Array(n).fill(null),
+  curveLock: Array(n).fill(null),
+  curveArc: Array(n).fill(null),
+  stationSnap: false,
+});
+const shift = (index, dx, dy) =>
+  job.nodes.map((node, i) => (i === index ? [node[0] + dx, node[1] + dy] : node));
+
+/** 저장 기준 — 저장 노선 지반 첫 계획선(관 측점 포함 · 서버 정책 그대로). */
+async function savedBaseOf() {
+  const seed = pipeMod.createDesignPipeline({
+    stages: {
+      route: routeGround.createRouteStage({
+        minRadiusM: () => job.minRadius,
+        savedLine: () => ({ line: job.line, curves: [] }),
+      }),
+      stations: stationsMod.createStationsStage({
+        intervalM: job.interval,
+        types: () => job.types,
+      }),
+      ground: routeGround.createGroundStage({ grid: () => local, remote: async () => [] }),
+    },
+  });
+  await seed.start({ route: null, alignment: null, cross: null, pipes: job.pipes, structures: [] });
+  const ground = seed.output("ground");
+  seed.dispose();
+  const samples = ground.longitudinal.chainageM.map((c, i) => ({
+    chainage_m: c,
+    elevation_m: ground.longitudinal.z[i],
+  }));
+  const profile = gradeGround.groundProfile(samples);
+  return {
+    policy: job.policy,
+    onlyExplicitCurves: false,
+    basePvi: gradeGround.groundFollowingBasePvi({
+      samples,
+      stations: ground.stations.map((s) => s.chainageM),
+      policy: job.policy,
+    }),
+    chainage: profile.chainage,
+    ground: profile.ground,
+    stations: ground.stations.map((s) => ({
+      station_id: grade.stationIdOf(s.chainageM),
+      chainage_m: s.chainageM,
+    })),
+  };
+}
+
+/** 새 노선 상세의 낡은 측점 — 설계 계획고 ≠ 지금 계획선(`staleKey` 와 같은 잣대 1 mm). */
+function staleOf(P, pipe) {
+  const shown = pageMod.pipelineDetail(P);
+  const profile = pipe.output("profile");
+  if (!shown || !profile) return null;
+  return shown.cross_sections
+    .filter(
+      (s) =>
+        s.design &&
+        Math.abs(s.design.design_elevation_m - alignment.planElevationAt(profile, s.chainage_m)) >
+          1e-3,
+    )
+    .map((s) => s.chainage_m);
+}
+
+async function run() {
+  const P = "proj-3490f";
+  window.localStorage.setItem("frd_current_project_id", P);
+  const savedBase = await savedBaseOf();
+  const seedRuns = runs().length;
+  const link = {
+    pipelineSource: () => ({
+      base: savedBase,
+      edits: alignment.emptyEdits(),
+      detail: job.detail,
+      routeId: 7,
+    }),
+    adoptPipeline: () => undefined,
+    redraw: () => undefined,
+  };
+  const bridge = pageMod.routeDraftBridge(P, link, { stationIntervalM: job.interval });
+  pageMod.pipelineEarthwork(P, { conversion: job.conversion });
+  const pipe = pageMod.pagePipeline(P);
+  let applied = 0;
+  const preview = previewMod.createCrossPreview({
+    projectId: P,
+    detail: () => null,
+    routeId: () => 7,
+    edits: () => alignment.emptyEdits(),
+    alignment: () => null,
+    debounceMs: () => 0,
+    onApplied: () => (applied += 1),
+  });
+  await settle(seedRuns + 1);
+
+  // ① 2번째 꺾임점을 서쪽으로 20 m — 노선 길이 바뀜(job.drags[0])
+  const [a, b] = job.drags;
+  const first = job.nodes.map((node, i) =>
+    i === a.index ? [node[0] + a.dx, node[1] + a.dy] : node,
+  );
+  bridge.edited(draftOf(first));
+  const pendingDuring = preview.scheduleIfStale("1:2", true);
+  const runOne = await settle(runs().length + 1);
+  await tick(job.haulDelayMs + 20);
+  const one = {
+    outcome: runOne.outcome,
+    length: pipe.output("route").lengthM,
+    stale: staleOf(P, pipe),
+    pendingAfter: preview.scheduleIfStale("1:2", true),
+  };
+
+  // ② 가운데 꺾임점을 북동으로 10 m(job.drags[1])
+  const second = first.map((node, i) => (i === b.index ? [node[0] + b.dx, node[1] + b.dy] : node));
+  bridge.edited(draftOf(second));
+  const runTwo = await settle(runs().length + 1);
+  await tick(job.haulDelayMs + 20);
+  const two = {
+    outcome: runTwo.outcome,
+    length: pipe.output("route").lengthM,
+    stale: staleOf(P, pipe),
+    reused: runTwo.stages.cross !== undefined,
+    pendingAfter: preview.scheduleIfStale("1:2", true),
+    pendingSaved: preview.scheduleIfStale("", true),
+  };
+
+  // ③ 그 차례 cross 가 끝내 안 와도(단계 실패) 3 s 뒤 풂 · 다시 그림
+  const store = storeMod.useDesignStore(P, null);
+  const before = applied;
+  store.set("generation", pipe.generation + 100);
+  const stuck = preview.scheduleIfStale("1:2", true);
+  await tick(3100);
+  const released = {
+    stuck,
+    after: preview.scheduleIfStale("1:2", true),
+    redrew: applied - before,
+  };
+  preview.dispose();
+  pageMod.disposePagePipeline(P);
+  page.clearDrafts(P);
+  return { pendingDuring, one, two, released, savedLength: savedBase.chainage.at(-1) };
+}
+
+run()
+  .then((out) => {
+    process.stdout.write(JSON.stringify(out));
+    process.exit(0);
+  })
+  .catch((error) => {
+    process.stderr.write(String(error && error.stack ? error.stack : error));
+    process.exit(1);
+  });
diff --git a/resources/tester/test_317_3d_update.py b/resources/tester/test_317_3d_update.py
index 518c79650..125f2a936 100644
--- a/resources/tester/test_317_3d_update.py
+++ b/resources/tester/test_317_3d_update.py
@@ -55,7 +55,10 @@ def test_same_stale_key_schedules_once(result: dict) -> None:
 def test_draw_and_button_wiring() -> None:
     panel = _read("A00_Common", "design", "design_profile.ts")
     # 노선 초안 동안(346-2 붙임)은 계산 묶음 cross 를 기다림 — 그 밖은 같은 낡음 한 번만 다시 셈
-    assert "crossPreview.scheduleIfStale(key)" in panel and "onStaleDesigns: (key) =>" in panel
+    assert (
+        "crossPreview.scheduleIfStale(key, store === preview)" in panel
+        and "onStaleDesigns: (key) =>" in panel
+    )
     render = _read("B05_Profile", "B05_Profile_UI_Profile_Render.ts")
     # 다시 셈 뒤에도 남은 낡음은 기다림 끝 — 곡선은 그리고 그 측점만 표시(342-1)
     assert 'const pending = ctx.onStaleDesigns?.(stale) ?? stale !== "";' in render
diff --git a/resources/tester/test_349_0f_draft_stale.py b/resources/tester/test_349_0f_draft_stale.py
new file mode 100644
index 000000000..a322fff67
--- /dev/null
+++ b/resources/tester/test_349_0f_draft_stale.py
@@ -0,0 +1,126 @@
+"""PLAN 349-0f — 노선 초안 동안 유토곡선 「다시 계산 중…」 머묾.
+
+· 두 번 끌기(2번째 꺾임점 서쪽 20 m = 길이 바뀜 · 가운데 꺾임점 북동 10 m) 뒤 새 노선 횡단 낡음 0
+  (cross 단계가 바뀐 범위 밖 측점도 계획고가 바뀌었으면 다시 셈)
+· 「다시 계산 중」 = 묶음 그 차례 cross 를 기다리는 동안만 · 끝나면 풂 · 남은 낡음은 곡선 + 그 측점(342-1)
+· 그 차례 cross 가 끝내 안 와도 3 s 뒤 풂 · 다시 그림
+짝: `helper_349_0f_draft_stale.cjs` · 지형 · 노선 · 관 틀 = `test_346_2_pipeline_cross_page.py`.
+"""
+
+from __future__ import annotations
+
+import json
+import subprocess
+import sys
+import tempfile
+from pathlib import Path
+
+import pytest
+
+HERE = Path(__file__).resolve().parent
+ROOT = HERE.parents[1]
+for path in (ROOT, HERE):
+    if str(path) not in sys.path:
+        sys.path.insert(0, str(path))
+
+from B05_Profile.B05_Profile_Engine_Grade import resolve_grade_options  # noqa: E402
+from B05_Profile.B05_Profile_Engine_Grade_Profile import (  # noqa: E402
+    design_ground_following_profile,
+)
+from common_util.common_util_surface_sampler import DtmGridSampler, dtm_grid_bytes  # noqa: E402
+from config.config_system_design import STANDARD_CROSS_SECTION  # noqa: E402
+from shapely.geometry import LineString, Point  # noqa: E402
+from test_346_2_pipeline_cross_page import (  # noqa: E402
+    MIN_RADIUS_M,
+    INTERVAL_M,
+    ONES,
+    _fake,
+    _real,
+    _line,
+    _pipes,
+    _saved_detail,
+    _sections,
+    _types,
+)
+
+pytestmark = pytest.mark.skipif(
+    not (ROOT / "config" / "node_modules" / "typescript").is_dir(),
+    reason="프론트엔드 의존성 미설치",
+)
+
+
+def _drags(nodes: list[list[float]], line: list[list[float]]) -> list[dict]:
+    """① 2번째 꺾임점 서쪽 20 m · ② 25+0(500 m) 가까운 꺾임점 북동 10 m(짧은 노선은 가운데)."""
+    shape = LineString(line)
+    target = min(500.0, shape.length / 2)
+    inner = [i for i in range(2, len(nodes) - 1)] or [1]
+    second = min(inner, key=lambda i: abs(shape.project(Point(nodes[i])) - target))
+    return [
+        {"index": 1, "dx": -20.0, "dy": 0.0},
+        {"index": second, "dx": 7.07, "dy": 7.07},
+    ]
+
+
+@pytest.fixture(scope="module", params=[_fake, _real], ids=["가짜", "검증_sub7"])
+def r(request) -> dict:
+    with tempfile.TemporaryDirectory() as folder:
+        npz, nodes = request.param(Path(folder))
+        line = _line(nodes)
+        sampler = DtmGridSampler.from_npz(npz)
+        pipes = _pipes(line)
+        saved = _sections(line, sampler, pipes)
+        options = resolve_grade_options("trunk", terrain_type="normal", paved=False, stored=None)
+        policy = design_ground_following_profile(saved["longitudinal"], options)[0]["policy"]
+        job = {
+            "nodes": nodes,
+            "line": line,
+            "minRadius": MIN_RADIUS_M,
+            "policy": policy,
+            "types": _types(),
+            "interval": INTERVAL_M,
+            "pipes": pipes,
+            "standard": STANDARD_CROSS_SECTION,
+            "conversion": ONES,
+            "detail": _saved_detail(saved),
+            "haulDelayMs": 20,
+            "drags": _drags(nodes, line),
+        }
+        path = Path(folder) / "job.json"
+        path.write_text(json.dumps(job), encoding="utf-8")
+        grid = Path(folder) / "grid.bin"
+        grid.write_bytes(dtm_grid_bytes(npz))
+        proc = subprocess.run(  # noqa: S603 — 고정 실행 파일
+            ["node", str(HERE / "helper_349_0f_draft_stale.cjs"), str(path), str(grid)],
+            capture_output=True,
+            text=True,
+            encoding="utf-8",
+            timeout=180,
+        )
+        assert proc.returncode == 0, proc.stderr
+        return json.loads(proc.stdout)
+
+
+def test_길이_바뀐_끌기_뒤_낡음_0(r):
+    one = r["one"]
+    assert one["outcome"] == "done"
+    assert abs(one["length"] - r["savedLength"]) > 1  # 노선 길이 바뀜
+    assert one["stale"] == []
+
+
+def test_가운데_꺾임점_끌기_뒤_낡음_0(r):
+    two = r["two"]
+    assert two["outcome"] == "done" and two["reused"]
+    assert two["stale"] == []
+
+
+def test_다시_계산_중은_그_차례_cross_까지만(r):
+    assert r["pendingDuring"] is True  # 끌어 놓은 차례 — cross 기다림
+    assert r["one"]["pendingAfter"] is False  # cross 끝 — 남은 낡음은 곡선 + 그 측점
+    assert r["two"]["pendingAfter"] is False
+    assert r["two"]["pendingSaved"] is False
+
+
+def test_cross_가_안_와도_3초_뒤_풂(r):
+    released = r["released"]
+    assert released["stuck"] is True
+    assert released["after"] is False and released["redrew"] == 1