diff --git a/graph-persistence.js b/graph-persistence.js
new file mode 100644
index 0000000..af7e941
--- /dev/null
+++ b/graph-persistence.js
@@ -0,0 +1,238 @@
+// ST-BME: 图谱持久化常量与纯工具函数
+// 不依赖 index.js 模块级可变状态（currentGraph / graphPersistenceState 等）
+
+import {
+  deserializeGraph,
+  serializeGraph,
+} from "./graph.js";
+import { normalizeGraphRuntimeState } from "./runtime-state.js";
+
+// ═══════════════════════════════════════════════════════════
+// 常量
+// ═══════════════════════════════════════════════════════════
+
+export const MODULE_NAME = "st_bme";
+export const GRAPH_METADATA_KEY = "st_bme_graph";
+export const GRAPH_PERSISTENCE_META_KEY = "__stBmePersistence";
+export const GRAPH_LOAD_STATES = Object.freeze({
+  NO_CHAT: "no-chat",
+  LOADING: "loading",
+  LOADED: "loaded",
+  SHADOW_RESTORED: "shadow-restored",
+  EMPTY_CONFIRMED: "empty-confirmed",
+  BLOCKED: "blocked",
+});
+export const GRAPH_LOAD_PENDING_CHAT_ID = "__pending_chat__";
+export const GRAPH_SHADOW_SNAPSHOT_STORAGE_PREFIX = `${MODULE_NAME}:graph-shadow:`;
+export const GRAPH_STARTUP_RECONCILE_DELAYS_MS = [150, 600, 1800, 4000];
+
+// ═══════════════════════════════════════════════════════════
+// 纯工具
+// ═══════════════════════════════════════════════════════════
+
+export function cloneRuntimeDebugValue(value, fallback = null) {
+  if (value == null) {
+    return fallback;
+  }
+
+  try {
+    return JSON.parse(JSON.stringify(value));
+  } catch {
+    return fallback ?? value;
+  }
+}
+
+export function createLocalIntegritySlug() {
+  const nativeUuid = globalThis.crypto?.randomUUID?.();
+  if (nativeUuid) return nativeUuid;
+  return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, (char) => {
+    const random = Math.floor(Math.random() * 16);
+    const value = char === "x" ? random : (random & 0x3) | 0x8;
+    return value.toString(16);
+  });
+}
+
+export const GRAPH_PERSISTENCE_SESSION_ID = createLocalIntegritySlug();
+
+// ═══════════════════════════════════════════════════════════
+// 图谱持久化元数据
+// ═══════════════════════════════════════════════════════════
+
+/**
+ * @param {object} graph
+ * @returns {object|null}
+ */
+export function getGraphPersistenceMeta(graph) {
+  if (!graph || typeof graph !== "object" || Array.isArray(graph)) {
+    return null;
+  }
+  const meta = graph[GRAPH_PERSISTENCE_META_KEY];
+  if (!meta || typeof meta !== "object" || Array.isArray(meta)) {
+    return null;
+  }
+  return meta;
+}
+
+/**
+ * @param {object} graph
+ * @returns {number}
+ */
+export function getGraphPersistedRevision(graph) {
+  const revision = Number(getGraphPersistenceMeta(graph)?.revision);
+  return Number.isFinite(revision) && revision > 0 ? revision : 0;
+}
+
+/**
+ * @param {object} graph
+ * @param {object} opts
+ * @param {number} [opts.revision]
+ * @param {string} [opts.reason]
+ * @param {string} [opts.chatId]
+ * @param {string} [opts.integrity]
+ */
+export function stampGraphPersistenceMeta(
+  graph,
+  { revision = 0, reason = "", chatId = "", integrity = "" } = {},
+) {
+  if (!graph || typeof graph !== "object" || Array.isArray(graph)) {
+    return null;
+  }
+
+  const existingMeta = getGraphPersistenceMeta(graph) || {};
+  const nextMeta = {
+    ...existingMeta,
+    revision: Number.isFinite(revision) && revision > 0 ? revision : 0,
+    updatedAt: new Date().toISOString(),
+    sessionId: GRAPH_PERSISTENCE_SESSION_ID,
+    reason: String(reason || ""),
+    chatId: String(chatId || existingMeta.chatId || ""),
+    integrity: String(integrity || existingMeta.integrity || ""),
+  };
+  graph[GRAPH_PERSISTENCE_META_KEY] = nextMeta;
+  return nextMeta;
+}
+
+// ═══════════════════════════════════════════════════════════
+// 聊天元数据
+// ═══════════════════════════════════════════════════════════
+
+export function writeChatMetadataPatch(context, patch = {}) {
+  if (!context) return false;
+  if (typeof context.updateChatMetadata === "function") {
+    context.updateChatMetadata(patch);
+    return true;
+  }
+
+  if (
+    !context.chatMetadata ||
+    typeof context.chatMetadata !== "object" ||
+    Array.isArray(context.chatMetadata)
+  ) {
+    context.chatMetadata = {};
+  }
+  Object.assign(context.chatMetadata, patch || {});
+  return true;
+}
+
+// ═══════════════════════════════════════════════════════════
+// Shadow Snapshot（会话存储）
+// ═══════════════════════════════════════════════════════════
+
+export function getGraphShadowSnapshotStorageKey(chatId = "") {
+  const normalizedChatId = String(chatId || "").trim();
+  if (!normalizedChatId) return "";
+  return `${GRAPH_SHADOW_SNAPSHOT_STORAGE_PREFIX}${encodeURIComponent(normalizedChatId)}`;
+}
+
+export function readGraphShadowSnapshot(chatId = "") {
+  const storageKey = getGraphShadowSnapshotStorageKey(chatId);
+  if (!storageKey) return null;
+
+  try {
+    const raw = globalThis.sessionStorage?.getItem(storageKey);
+    if (!raw) return null;
+    const snapshot = JSON.parse(raw);
+    if (
+      !snapshot ||
+      typeof snapshot !== "object" ||
+      String(snapshot.chatId || "") !== String(chatId || "") ||
+      typeof snapshot.serializedGraph !== "string" ||
+      !snapshot.serializedGraph
+    ) {
+      return null;
+    }
+    return {
+      chatId: String(snapshot.chatId || ""),
+      revision: Number.isFinite(snapshot.revision) ? snapshot.revision : 0,
+      serializedGraph: snapshot.serializedGraph,
+      updatedAt: String(snapshot.updatedAt || ""),
+      reason: String(snapshot.reason || ""),
+    };
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * @param {string} chatId
+ * @param {object} graph
+ * @param {object} [opts]
+ * @param {number} [opts.revision]
+ * @param {string} [opts.reason]
+ */
+export function writeGraphShadowSnapshot(
+  chatId,
+  graph,
+  { revision = 0, reason = "" } = {},
+) {
+  const storageKey = getGraphShadowSnapshotStorageKey(chatId);
+  if (!storageKey || !graph) return false;
+
+  try {
+    const serializedGraph = serializeGraph(graph);
+    globalThis.sessionStorage?.setItem(
+      storageKey,
+      JSON.stringify({
+        chatId: String(chatId || ""),
+        revision: Number.isFinite(revision) ? revision : 0,
+        serializedGraph,
+        updatedAt: new Date().toISOString(),
+        reason: String(reason || ""),
+      }),
+    );
+    return true;
+  } catch (error) {
+    console.warn("[ST-BME] 写入会话图谱临时快照失败:", error);
+    return false;
+  }
+}
+
+export function removeGraphShadowSnapshot(chatId = "") {
+  const storageKey = getGraphShadowSnapshotStorageKey(chatId);
+  if (!storageKey) return false;
+
+  try {
+    globalThis.sessionStorage?.removeItem(storageKey);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+// ═══════════════════════════════════════════════════════════
+// 图谱克隆 / 比较
+// ═══════════════════════════════════════════════════════════
+
+export function cloneGraphForPersistence(graph, chatId = "") {
+  return normalizeGraphRuntimeState(
+    deserializeGraph(serializeGraph(graph)),
+    chatId,
+  );
+}
+
+export function shouldPreferShadowSnapshotOverOfficial(officialGraph, shadowSnapshot) {
+  if (!shadowSnapshot) return false;
+  const shadowRevision = Number(shadowSnapshot.revision || 0);
+  const officialRevision = getGraphPersistedRevision(officialGraph);
+  return shadowRevision > 0 && shadowRevision > officialRevision;
+}
diff --git a/index.js b/index.js
index a90aa49..000e173 100644
--- a/index.js
+++ b/index.js
@@ -102,117 +102,39 @@ import {
   setBatchStageOutcome,
   shouldRunRecallForTransaction,
 } from "./ui-status.js";
+import {
+  cloneGraphForPersistence,
+  cloneRuntimeDebugValue,
+  getGraphPersistenceMeta,
+  getGraphPersistedRevision,
+  getGraphShadowSnapshotStorageKey,
+  GRAPH_LOAD_PENDING_CHAT_ID,
+  GRAPH_LOAD_STATES,
+  GRAPH_METADATA_KEY,
+  GRAPH_PERSISTENCE_META_KEY,
+  GRAPH_PERSISTENCE_SESSION_ID,
+  GRAPH_SHADOW_SNAPSHOT_STORAGE_PREFIX,
+  GRAPH_STARTUP_RECONCILE_DELAYS_MS,
+  MODULE_NAME,
+  readGraphShadowSnapshot,
+  removeGraphShadowSnapshot,
+  shouldPreferShadowSnapshotOverOfficial,
+  stampGraphPersistenceMeta,
+  writeChatMetadataPatch,
+  writeGraphShadowSnapshot,
+} from "./graph-persistence.js";
 
 // 操控面板模块（动态加载，防止加载失败崩溃整个扩展）
 let _panelModule = null;
 let _themesModule = null;
 
-const MODULE_NAME = "st_bme";
-const GRAPH_METADATA_KEY = "st_bme_graph";
-const GRAPH_PERSISTENCE_META_KEY = "__stBmePersistence";
 const SERVER_SETTINGS_FILENAME = "st-bme-settings.json";
 const SERVER_SETTINGS_URL = `/user/files/${SERVER_SETTINGS_FILENAME}`;
-const GRAPH_LOAD_STATES = Object.freeze({
-  NO_CHAT: "no-chat",
-  LOADING: "loading",
-  LOADED: "loaded",
-  SHADOW_RESTORED: "shadow-restored",
-  EMPTY_CONFIRMED: "empty-confirmed",
-  BLOCKED: "blocked",
-});
-const GRAPH_LOAD_PENDING_CHAT_ID = "__pending_chat__";
-const GRAPH_SHADOW_SNAPSHOT_STORAGE_PREFIX = `${MODULE_NAME}:graph-shadow:`;
-const GRAPH_STARTUP_RECONCILE_DELAYS_MS = [150, 600, 1800, 4000];
-
-function cloneRuntimeDebugValue(value, fallback = null) {
-  if (value == null) {
-    return fallback;
-  }
-
-  try {
-    return JSON.parse(JSON.stringify(value));
-  } catch {
-    return fallback ?? value;
-  }
-}
-
-function createLocalIntegritySlug() {
-  const nativeUuid = globalThis.crypto?.randomUUID?.();
-  if (nativeUuid) return nativeUuid;
-  return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, (char) => {
-    const random = Math.floor(Math.random() * 16);
-    const value = char === "x" ? random : (random & 0x3) | 0x8;
-    return value.toString(16);
-  });
-}
-
-const GRAPH_PERSISTENCE_SESSION_ID = createLocalIntegritySlug();
-
-function getGraphPersistenceMeta(graph = currentGraph) {
-  if (!graph || typeof graph !== "object" || Array.isArray(graph)) {
-    return null;
-  }
-  const meta = graph[GRAPH_PERSISTENCE_META_KEY];
-  if (!meta || typeof meta !== "object" || Array.isArray(meta)) {
-    return null;
-  }
-  return meta;
-}
-
-function getGraphPersistedRevision(graph = currentGraph) {
-  const revision = Number(getGraphPersistenceMeta(graph)?.revision);
-  return Number.isFinite(revision) && revision > 0 ? revision : 0;
-}
-
-function stampGraphPersistenceMeta(
-  graph = currentGraph,
-  {
-    revision = graphPersistenceState.revision,
-    reason = "",
-    chatId = getCurrentChatId(),
-    integrity = "",
-  } = {},
-) {
-  if (!graph || typeof graph !== "object" || Array.isArray(graph)) {
-    return null;
-  }
-
-  const existingMeta = getGraphPersistenceMeta(graph) || {};
-  const nextMeta = {
-    ...existingMeta,
-    revision: Number.isFinite(revision) && revision > 0 ? revision : 0,
-    updatedAt: new Date().toISOString(),
-    sessionId: GRAPH_PERSISTENCE_SESSION_ID,
-    reason: String(reason || ""),
-    chatId: String(chatId || existingMeta.chatId || ""),
-    integrity: String(integrity || existingMeta.integrity || ""),
-  };
-  graph[GRAPH_PERSISTENCE_META_KEY] = nextMeta;
-  return nextMeta;
-}
 
 function getChatMetadataIntegrity(context = getContext()) {
   return normalizeChatIdCandidate(context?.chatMetadata?.integrity);
 }
 
-function writeChatMetadataPatch(context = getContext(), patch = {}) {
-  if (!context) return false;
-  if (typeof context.updateChatMetadata === "function") {
-    context.updateChatMetadata(patch);
-    return true;
-  }
-
-  if (
-    !context.chatMetadata ||
-    typeof context.chatMetadata !== "object" ||
-    Array.isArray(context.chatMetadata)
-  ) {
-    context.chatMetadata = {};
-  }
-  Object.assign(context.chatMetadata, patch || {});
-  return true;
-}
-
 function triggerChatMetadataSave(
   context = getContext(),
   { immediate = false } = {},
@@ -245,23 +167,6 @@ function triggerChatMetadataSave(
   return "debounced";
 }
 
-function cloneGraphForPersistence(
-  graph = currentGraph,
-  chatId = getCurrentChatId(),
-) {
-  return normalizeGraphRuntimeState(
-    deserializeGraph(serializeGraph(graph)),
-    chatId,
-  );
-}
-
-function shouldPreferShadowSnapshotOverOfficial(officialGraph, shadowSnapshot) {
-  if (!shadowSnapshot) return false;
-  const shadowRevision = Number(shadowSnapshot.revision || 0);
-  const officialRevision = getGraphPersistedRevision(officialGraph);
-  return shadowRevision > 0 && shadowRevision > officialRevision;
-}
-
 function getRuntimeDebugState() {
   const stateKey = "__stBmeRuntimeDebugState";
   if (!globalThis[stateKey] || typeof globalThis[stateKey] !== "object") {
@@ -493,80 +398,6 @@ const stageAbortControllers = {
   history: null,
 };
 
-function getGraphShadowSnapshotStorageKey(chatId = "") {
-  const normalizedChatId = String(chatId || "").trim();
-  if (!normalizedChatId) return "";
-  return `${GRAPH_SHADOW_SNAPSHOT_STORAGE_PREFIX}${encodeURIComponent(normalizedChatId)}`;
-}
-
-function readGraphShadowSnapshot(chatId = "") {
-  const storageKey = getGraphShadowSnapshotStorageKey(chatId);
-  if (!storageKey) return null;
-
-  try {
-    const raw = globalThis.sessionStorage?.getItem(storageKey);
-    if (!raw) return null;
-    const snapshot = JSON.parse(raw);
-    if (
-      !snapshot ||
-      typeof snapshot !== "object" ||
-      String(snapshot.chatId || "") !== String(chatId || "") ||
-      typeof snapshot.serializedGraph !== "string" ||
-      !snapshot.serializedGraph
-    ) {
-      return null;
-    }
-    return {
-      chatId: String(snapshot.chatId || ""),
-      revision: Number.isFinite(snapshot.revision) ? snapshot.revision : 0,
-      serializedGraph: snapshot.serializedGraph,
-      updatedAt: String(snapshot.updatedAt || ""),
-      reason: String(snapshot.reason || ""),
-    };
-  } catch {
-    return null;
-  }
-}
-
-function writeGraphShadowSnapshot(
-  chatId = "",
-  graph = currentGraph,
-  { revision = graphPersistenceState.revision, reason = "" } = {},
-) {
-  const storageKey = getGraphShadowSnapshotStorageKey(chatId);
-  if (!storageKey || !graph) return false;
-
-  try {
-    const serializedGraph = serializeGraph(graph);
-    globalThis.sessionStorage?.setItem(
-      storageKey,
-      JSON.stringify({
-        chatId: String(chatId || ""),
-        revision: Number.isFinite(revision) ? revision : 0,
-        serializedGraph,
-        updatedAt: new Date().toISOString(),
-        reason: String(reason || ""),
-      }),
-    );
-    return true;
-  } catch (error) {
-    console.warn("[ST-BME] 写入会话图谱临时快照失败:", error);
-    return false;
-  }
-}
-
-function removeGraphShadowSnapshot(chatId = "") {
-  const storageKey = getGraphShadowSnapshotStorageKey(chatId);
-  if (!storageKey) return false;
-
-  try {
-    globalThis.sessionStorage?.removeItem(storageKey);
-    return true;
-  } catch {
-    return false;
-  }
-}
-
 function getGraphPersistenceLiveState() {
   const snapshot = {
     loadState: graphPersistenceState.loadState,
diff --git a/tests/graph-persistence.mjs b/tests/graph-persistence.mjs
index 6baa3d9..3324e45 100644
--- a/tests/graph-persistence.mjs
+++ b/tests/graph-persistence.mjs
@@ -27,6 +27,27 @@ import {
   clampFloat,
   formatRecallContextLine,
 } from "../ui-status.js";
+import {
+  cloneGraphForPersistence,
+  cloneRuntimeDebugValue,
+  getGraphPersistenceMeta,
+  getGraphPersistedRevision,
+  getGraphShadowSnapshotStorageKey,
+  GRAPH_LOAD_PENDING_CHAT_ID,
+  GRAPH_LOAD_STATES,
+  GRAPH_METADATA_KEY,
+  GRAPH_PERSISTENCE_META_KEY,
+  GRAPH_PERSISTENCE_SESSION_ID,
+  GRAPH_SHADOW_SNAPSHOT_STORAGE_PREFIX,
+  GRAPH_STARTUP_RECONCILE_DELAYS_MS,
+  MODULE_NAME,
+  readGraphShadowSnapshot,
+  removeGraphShadowSnapshot,
+  shouldPreferShadowSnapshotOverOfficial,
+  stampGraphPersistenceMeta,
+  writeChatMetadataPatch,
+  writeGraphShadowSnapshot,
+} from "../graph-persistence.js";
 
 const moduleDir = path.dirname(fileURLToPath(import.meta.url));
 const indexPath = path.resolve(moduleDir, "../index.js");
@@ -42,7 +63,7 @@ function extractSnippet(startMarker, endMarker) {
 }
 
 const persistencePrelude = extractSnippet(
-  'const MODULE_NAME = "st_bme";',
+  'const SERVER_SETTINGS_FILENAME = "st-bme-settings.json";',
   "function clearInjectionState(options = {}) {",
 );
 const persistenceCore = extractSnippet(
@@ -204,6 +225,64 @@ async function createGraphPersistenceHarness({
     clampInt,
     clampFloat,
     formatRecallContextLine,
+    cloneGraphForPersistence,
+    cloneRuntimeDebugValue,
+    getGraphPersistenceMeta,
+    getGraphPersistedRevision,
+    getGraphShadowSnapshotStorageKey,
+    GRAPH_LOAD_PENDING_CHAT_ID,
+    GRAPH_LOAD_STATES,
+    GRAPH_METADATA_KEY,
+    GRAPH_PERSISTENCE_META_KEY,
+    GRAPH_PERSISTENCE_SESSION_ID,
+    GRAPH_SHADOW_SNAPSHOT_STORAGE_PREFIX,
+    GRAPH_STARTUP_RECONCILE_DELAYS_MS,
+    MODULE_NAME,
+    readGraphShadowSnapshot,
+    removeGraphShadowSnapshot,
+    shouldPreferShadowSnapshotOverOfficial,
+    stampGraphPersistenceMeta,
+    writeChatMetadataPatch,
+    writeGraphShadowSnapshot,
+    // Shadow snapshot functions need VM-local sessionStorage overrides
+    // because imported versions use the outer globalThis (no sessionStorage)
+    readGraphShadowSnapshot(chatId = "") {
+      const key = getGraphShadowSnapshotStorageKey(chatId);
+      if (!key) return null;
+      try {
+        const raw = storage.getItem(key);
+        if (!raw) return null;
+        const snap = JSON.parse(raw);
+        if (!snap || String(snap.chatId || "") !== String(chatId || "") ||
+            typeof snap.serializedGraph !== "string" || !snap.serializedGraph) return null;
+        return {
+          chatId: String(snap.chatId || ""),
+          revision: Number.isFinite(snap.revision) ? snap.revision : 0,
+          serializedGraph: snap.serializedGraph,
+          updatedAt: String(snap.updatedAt || ""),
+          reason: String(snap.reason || ""),
+        };
+      } catch { return null; }
+    },
+    writeGraphShadowSnapshot(chatId = "", graph = null, { revision = 0, reason = "" } = {}) {
+      const key = getGraphShadowSnapshotStorageKey(chatId);
+      if (!key || !graph) return false;
+      try {
+        storage.setItem(key, JSON.stringify({
+          chatId: String(chatId || ""),
+          revision: Number.isFinite(revision) ? revision : 0,
+          serializedGraph: serializeGraph(graph),
+          updatedAt: new Date().toISOString(),
+          reason: String(reason || ""),
+        }));
+        return true;
+      } catch { return false; }
+    },
+    removeGraphShadowSnapshot(chatId = "") {
+      const key = getGraphShadowSnapshotStorageKey(chatId);
+      if (!key) return false;
+      try { storage.removeItem(key); return true; } catch { return false; }
+    },
     createDefaultTaskProfiles() {
       return {
         extract: { activeProfileId: "default", profiles: [] },
diff --git a/tests/p0-regressions.mjs b/tests/p0-regressions.mjs
index 3bff7ab..101676c 100644
--- a/tests/p0-regressions.mjs
+++ b/tests/p0-regressions.mjs
@@ -30,6 +30,18 @@ import {
   setBatchStageOutcome,
   shouldRunRecallForTransaction,
 } from "../ui-status.js";
+import {
+  cloneRuntimeDebugValue,
+  GRAPH_LOAD_STATES,
+  GRAPH_METADATA_KEY,
+  GRAPH_PERSISTENCE_META_KEY,
+  GRAPH_PERSISTENCE_SESSION_ID,
+  MODULE_NAME,
+  readGraphShadowSnapshot,
+  stampGraphPersistenceMeta,
+  writeChatMetadataPatch,
+  writeGraphShadowSnapshot,
+} from "../graph-persistence.js";
 
 const extensionsShimSource = [
   "export const extension_settings = globalThis.__p0ExtensionSettings || {};",
@@ -276,6 +288,10 @@ function createGenerationRecallHarness() {
       getStageNoticeTitle,
       getStageNoticeDuration,
       normalizeStageNoticeLevel,
+      MODULE_NAME,
+      GRAPH_LOAD_STATES,
+      GRAPH_METADATA_KEY,
+      GRAPH_PERSISTENCE_META_KEY,
     };
     vm.createContext(context);
     vm.runInContext(