diff --git a/graph/graph-v3-namespace.js b/graph/graph-v3-namespace.js
index ef5b862..3ec52d8 100644
--- a/graph/graph-v3-namespace.js
+++ b/graph/graph-v3-namespace.js
@@ -7,6 +7,7 @@ export const GRAPH_V3_NAMESPACE_VERSION = 3;
 export const GRAPH_V3_MODULE_NAME = "st_bme_v3";
 
 export const GRAPH_V3_METADATA_KEY = `${GRAPH_V3_MODULE_NAME}_graph`;
+export const GRAPH_V3_HEAD_KEY = `${GRAPH_V3_MODULE_NAME}_graph_head`;
 export const GRAPH_V3_COMMIT_MARKER_KEY = `${GRAPH_V3_MODULE_NAME}_commit_marker`;
 export const GRAPH_V3_CHAT_STATE_NAMESPACE = `${GRAPH_V3_MODULE_NAME}_graph_state`;
 export const GRAPH_V3_LUKER_MANIFEST_NAMESPACE = `${GRAPH_V3_MODULE_NAME}_graph_manifest`;
@@ -65,6 +66,7 @@ export function listGraphV3NamespaceValues() {
   return Object.freeze([
     GRAPH_V3_MODULE_NAME,
     GRAPH_V3_METADATA_KEY,
+    GRAPH_V3_HEAD_KEY,
     GRAPH_V3_COMMIT_MARKER_KEY,
     GRAPH_V3_CHAT_STATE_NAMESPACE,
     GRAPH_V3_LUKER_MANIFEST_NAMESPACE,
diff --git a/package.json b/package.json
index 0a16564..d054265 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
     "test:persistence-reducer": "node tests/persistence-reducer.mjs",
     "test:graph-head": "node tests/graph-head.mjs",
     "test:graph-store-contract": "node tests/graph-store-contract.mjs",
+    "test:graph-store-v3-adapter": "node tests/graph-store-v3-adapter.mjs",
     "test:reroll-transaction-boundary": "node tests/reroll-transaction-boundary.mjs",
     "test:vector-gate": "node tests/vector-gate.mjs",
     "test:hide-engine": "node tests/hide-engine.mjs",
diff --git a/sync/graph-store-v3-adapter.js b/sync/graph-store-v3-adapter.js
new file mode 100644
index 0000000..6a0da1c
--- /dev/null
+++ b/sync/graph-store-v3-adapter.js
@@ -0,0 +1,172 @@
+// ST-BME v3 GraphStore adapter wrappers.
+//
+// These wrappers add v3 head/marker sidecar methods to existing stores without
+// changing their legacy load/save behavior. Physical namespace cutover is handled
+// by dedicated constructors/routes later.
+
+import {
+  GRAPH_V3_COMMIT_MARKER_KEY,
+  GRAPH_V3_HEAD_KEY,
+} from "../graph/graph-v3-namespace.js";
+import {
+  normalizeCommitMarkerV3,
+  normalizeGraphHead,
+} from "../graph/graph-head.js";
+import {
+  readGraphChatStateNamespaces,
+  writeGraphChatStatePayload,
+} from "../graph/graph-persistence.js";
+import { assertGraphStoreContract } from "./graph-store-contract.js";
+
+const GRAPH_STORE_V3_WRAPPED = Symbol.for("st-bme.graph-store-v3-wrapped");
+
+function bindStoreMethod(store = null, method = "") {
+  const value = store?.[method];
+  return typeof value === "function" ? value.bind(store) : value;
+}
+
+export function isGraphStoreV3Wrapped(store = null) {
+  return Boolean(store?.[GRAPH_STORE_V3_WRAPPED]);
+}
+
+export function wrapDbLikeGraphStoreV3(store = null) {
+  assertGraphStoreContract(store);
+  if (isGraphStoreV3Wrapped(store)) return store;
+
+  const wrapper = Object.create(store);
+  Object.defineProperty(wrapper, GRAPH_STORE_V3_WRAPPED, {
+    value: true,
+    enumerable: false,
+  });
+
+  for (const key of Reflect.ownKeys(store)) {
+    if (key === GRAPH_STORE_V3_WRAPPED) continue;
+    const descriptor = Object.getOwnPropertyDescriptor(store, key);
+    if (descriptor) Object.defineProperty(wrapper, key, descriptor);
+  }
+
+  for (const method of [
+    "open",
+    "close",
+    "getMeta",
+    "setMeta",
+    "patchMeta",
+    "commitDelta",
+    "exportSnapshot",
+    "exportSnapshotProbe",
+    "importSnapshot",
+    "isEmpty",
+    "clearAll",
+  ]) {
+    if (typeof store[method] === "function") {
+      wrapper[method] = bindStoreMethod(store, method);
+    }
+  }
+
+  wrapper.readHead = async ({ fallback = null } = {}) => {
+    const raw = await store.getMeta(GRAPH_V3_HEAD_KEY, null);
+    return raw == null ? fallback : normalizeGraphHead(raw, fallback || {});
+  };
+
+  wrapper.writeHead = async (head = null, { fallback = null } = {}) => {
+    const normalized = normalizeGraphHead(head, fallback || {});
+    await store.patchMeta({ [GRAPH_V3_HEAD_KEY]: normalized });
+    return normalized;
+  };
+
+  wrapper.readCommitMarker = async ({ fallback = null } = {}) => {
+    const raw = await store.getMeta(GRAPH_V3_COMMIT_MARKER_KEY, null);
+    return normalizeCommitMarkerV3(raw) || fallback;
+  };
+
+  wrapper.writeCommitMarker = async (marker = null) => {
+    const normalized = normalizeCommitMarkerV3(marker);
+    if (!normalized) {
+      const error = new Error("graph-store-v3-commit-marker-invalid");
+      error.code = "graph_store_v3_commit_marker_invalid";
+      throw error;
+    }
+    await store.patchMeta({ [GRAPH_V3_COMMIT_MARKER_KEY]: normalized });
+    return normalized;
+  };
+
+  wrapper.deleteAll = async (...args) => {
+    if (typeof store.clearAll !== "function") {
+      const error = new Error("graph-store-v3-delete-all-unavailable");
+      error.code = "graph_store_v3_delete_all_unavailable";
+      throw error;
+    }
+    return store.clearAll(...args);
+  };
+
+  return wrapper;
+}
+
+export function createLukerChatStateGraphStoreV3({
+  context = null,
+  chatStateTarget = null,
+  storeKind = "luker-chat-state",
+  storeMode = "luker-chat-state-v3",
+} = {}) {
+  async function readNamespace(namespace = "", fallback = null) {
+    const payloads = await readGraphChatStateNamespaces(context, [namespace], {
+      target: chatStateTarget,
+    });
+    return payloads.get(namespace) ?? fallback;
+  }
+
+  async function writeNamespace(namespace = "", payload = null) {
+    const result = await writeGraphChatStatePayload(context, namespace, payload, {
+      target: chatStateTarget,
+    });
+    if (result?.ok !== true) {
+      const error = new Error(result?.reason || "luker-graph-store-v3-write-failed");
+      error.code = "luker_graph_store_v3_write_failed";
+      error.result = result;
+      throw error;
+    }
+    return payload;
+  }
+
+  return {
+    storeKind,
+    storeMode,
+    async open() {
+      return this;
+    },
+    async close() {},
+    async getMeta(key = "", fallbackValue = null) {
+      return readNamespace(String(key || ""), fallbackValue);
+    },
+    async patchMeta(record = {}) {
+      const entries = Object.entries(record && typeof record === "object" ? record : {});
+      for (const [key, value] of entries) {
+        await writeNamespace(key, value);
+      }
+      return record;
+    },
+    async readHead({ fallback = null } = {}) {
+      const raw = await readNamespace(GRAPH_V3_HEAD_KEY, null);
+      return raw == null ? fallback : normalizeGraphHead(raw, fallback || {});
+    },
+    async writeHead(head = null, { fallback = null } = {}) {
+      const normalized = normalizeGraphHead(head, fallback || {});
+      await writeNamespace(GRAPH_V3_HEAD_KEY, normalized);
+      return normalized;
+    },
+    async readCommitMarker({ fallback = null } = {}) {
+      const raw = await readNamespace(GRAPH_V3_COMMIT_MARKER_KEY, null);
+      return normalizeCommitMarkerV3(raw) || fallback;
+    },
+    async writeCommitMarker(marker = null) {
+      const normalized = normalizeCommitMarkerV3(marker);
+      if (!normalized) {
+        const error = new Error("luker-graph-store-v3-commit-marker-invalid");
+        error.code = "luker_graph_store_v3_commit_marker_invalid";
+        throw error;
+      }
+      await writeNamespace(GRAPH_V3_COMMIT_MARKER_KEY, normalized);
+      return normalized;
+    },
+  };
+}
diff --git a/tests/graph-store-v3-adapter.mjs b/tests/graph-store-v3-adapter.mjs
new file mode 100644
index 0000000..b3fb402
--- /dev/null
+++ b/tests/graph-store-v3-adapter.mjs
@@ -0,0 +1,190 @@
+// ST-BME restrained rebirth — Phase 7 v3 GraphStore adapter tests.
+
+import assert from "node:assert/strict";
+import {
+  GRAPH_V3_COMMIT_MARKER_KEY,
+  GRAPH_V3_HEAD_KEY,
+  GRAPH_V3_METADATA_KEY,
+} from "../graph/graph-v3-namespace.js";
+import {
+  buildCommitMarkerV3,
+  normalizeGraphHead,
+  normalizeReplicaPointer,
+} from "../graph/graph-head.js";
+import { GRAPH_STORE_REQUIRED_METHODS, inspectGraphStoreContract } from "../sync/graph-store-contract.js";
+import {
+  createLukerChatStateGraphStoreV3,
+  isGraphStoreV3Wrapped,
+  wrapDbLikeGraphStoreV3,
+} from "../sync/graph-store-v3-adapter.js";
+
+function createMockDbLikeStore() {
+  const meta = new Map();
+  const calls = [];
+  return {
+    storeKind: "indexeddb",
+    storeMode: "indexeddb-v3-test",
+    meta,
+    calls,
+    async open() {
+      calls.push(["open"]);
+      return this;
+    },
+    async close() {
+      calls.push(["close"]);
+    },
+    async getMeta(key, fallbackValue = null) {
+      calls.push(["getMeta", key]);
+      return meta.has(key) ? meta.get(key) : fallbackValue;
+    },
+    async patchMeta(record = {}) {
+      calls.push(["patchMeta", Object.keys(record).sort()]);
+      for (const [key, value] of Object.entries(record)) {
+        meta.set(key, value);
+      }
+      return record;
+    },
+    async commitDelta() {},
+    async exportSnapshot() {},
+    async exportSnapshotProbe() {},
+    async importSnapshot() {},
+    async clearAll() {
+      calls.push(["clearAll"]);
+      meta.clear();
+      return { ok: true };
+    },
+  };
+}
+
+const rawStore = createMockDbLikeStore();
+const wrapped = wrapDbLikeGraphStoreV3(rawStore);
+assert.equal(isGraphStoreV3Wrapped(wrapped), true);
+assert.equal(wrapDbLikeGraphStoreV3(wrapped), wrapped);
+
+const wrappedContract = inspectGraphStoreContract(wrapped);
+assert.equal(wrappedContract.valid, true);
+assert.ok(wrappedContract.supportedOptionalMethods.includes("readHead"));
+assert.ok(wrappedContract.supportedOptionalMethods.includes("writeCommitMarker"));
+assert.ok(wrappedContract.supportedOptionalMethods.includes("deleteAll"));
+
+const head = normalizeGraphHead({
+  graphId: "graph-a",
+  chatId: "chat-a",
+  integrity: "integrity-a",
+  revision: 9,
+  counts: { nodeCount: 2, edgeCount: 1 },
+});
+const writtenHead = await wrapped.writeHead(head);
+assert.equal(writtenHead.graphId, "graph-a");
+assert.deepEqual(await wrapped.readHead(), writtenHead);
+assert.deepEqual(rawStore.meta.get(GRAPH_V3_HEAD_KEY), writtenHead);
+assert.equal(rawStore.meta.has(GRAPH_V3_METADATA_KEY), false, "head must use dedicated v3 head key");
+
+const marker = buildCommitMarkerV3({
+  head,
+  replica: normalizeReplicaPointer({
+    graphId: head.graphId,
+    revision: head.revision,
+    storageTier: "indexeddb",
+    accepted: true,
+  }),
+});
+const writtenMarker = await wrapped.writeCommitMarker(marker);
+assert.equal(writtenMarker.accepted, true);
+assert.deepEqual(await wrapped.readCommitMarker(), writtenMarker);
+assert.deepEqual(rawStore.meta.get(GRAPH_V3_COMMIT_MARKER_KEY), writtenMarker);
+assert.equal(rawStore.meta.has("st_bme_commit_marker"), false, "legacy marker key must stay untouched");
+
+await wrapped.deleteAll();
+assert.equal(rawStore.meta.size, 0);
+
+console.log("  ✓ DB-like v3 wrapper adds head/marker methods without legacy key writes");
+
+class ClassBackedStore {
+  constructor() {
+    this.storeKind = "opfs";
+    this.storeMode = "class-backed-test";
+    this.meta = new Map();
+    this.clearCount = 0;
+  }
+
+  async open() {
+    return this;
+  }
+
+  async close() {}
+
+  async getMeta(key, fallbackValue = null) {
+    assert.equal(this instanceof ClassBackedStore, true, "wrapped methods must keep class instance this");
+    return this.meta.has(key) ? this.meta.get(key) : fallbackValue;
+  }
+
+  async patchMeta(record = {}) {
+    assert.equal(this instanceof ClassBackedStore, true, "patchMeta must run on the original class instance");
+    for (const [key, value] of Object.entries(record)) {
+      this.meta.set(key, value);
+    }
+    return record;
+  }
+
+  async commitDelta() {}
+  async exportSnapshot() {}
+  async exportSnapshotProbe() {}
+  async importSnapshot() {}
+
+  async clearAll() {
+    assert.equal(this instanceof ClassBackedStore, true, "deleteAll must delegate to class-backed clearAll");
+    this.clearCount += 1;
+  }
+}
+
+const classBackedRaw = new ClassBackedStore();
+const classBackedWrapped = wrapDbLikeGraphStoreV3(classBackedRaw);
+await classBackedWrapped.writeHead(head);
+assert.equal((await classBackedWrapped.readHead()).graphId, "graph-a");
+await classBackedWrapped.deleteAll();
+assert.equal(classBackedRaw.clearCount, 1);
+
+console.log("  ✓ DB-like wrapper preserves class-instance method binding");
+
+const chatState = new Map();
+const updatedNamespaces = [];
+const lukerContext = {
+  getChatState(namespace) {
+    return chatState.get(namespace) || null;
+  },
+  getChatStateBatch(namespaces) {
+    return new Map(namespaces.map((namespace) => [namespace, chatState.get(namespace) || null]));
+  },
+  updateChatState(namespace, updater) {
+    updatedNamespaces.push(namespace);
+    const next = updater(chatState.get(namespace) || null);
+    chatState.set(namespace, next);
+    return { ok: true, updated: true };
+  },
+};
+
+const lukerStore = createLukerChatStateGraphStoreV3({ context: lukerContext });
+const lukerContract = inspectGraphStoreContract(lukerStore, {
+  requiredMethods: ["open", "close", "getMeta", "patchMeta", "readHead", "writeHead", "readCommitMarker", "writeCommitMarker"],
+});
+assert.equal(lukerContract.valid, true);
+for (const requiredMethod of GRAPH_STORE_REQUIRED_METHODS) {
+  if (["commitDelta", "exportSnapshot", "exportSnapshotProbe", "importSnapshot"].includes(requiredMethod)) {
+    assert.equal(
+      typeof lukerStore[requiredMethod],
+      "undefined",
+      `Luker thin wrapper must not claim unsupported DB-like method ${requiredMethod}`,
+    );
+  }
+}
+
+await lukerStore.writeHead(head);
+await lukerStore.writeCommitMarker(marker);
+assert.deepEqual(await lukerStore.readHead(), head);
+assert.deepEqual(await lukerStore.readCommitMarker(), marker);
+assert.deepEqual(updatedNamespaces, [GRAPH_V3_HEAD_KEY, GRAPH_V3_COMMIT_MARKER_KEY]);
+assert.equal(chatState.has("st_bme_graph_state"), false, "Luker wrapper must not write legacy chat-state namespace");
+
+console.log("  ✓ Luker v3 wrapper writes only v3 head/marker namespaces");
+console.log("graph-store-v3-adapter tests passed");