diff --git a/packages/gittensory-miner/lib/portfolio-queue-manager.d.ts b/packages/gittensory-miner/lib/portfolio-queue-manager.d.ts
new file mode 100644
index 0000000000..68ecee9b93
--- /dev/null
+++ b/packages/gittensory-miner/lib/portfolio-queue-manager.d.ts
@@ -0,0 +1,46 @@
+import type { PortfolioCaps } from "@jsonbored/gittensory-engine";
+import type { EnqueueItem, PortfolioQueueStore, QueueEntry } from "./portfolio-queue.js";
+
+export type PortfolioQueueClaimTarget = {
+  repoFullName: string;
+  identifier: string;
+};
+
+export function queueItemId(repoFullName: string, identifier: string): string;
+
+export function parseQueueItemId(id: string): PortfolioQueueClaimTarget;
+
+export function normalizePortfolioCaps(caps?: Partial<PortfolioCaps>): PortfolioCaps;
+
+export function entriesToPortfolioQueue(entries: QueueEntry[]): {
+  buckets: Array<{
+    repoFullName: string;
+    items: Array<{ id: string; repoFullName: string; state: "queued" | "in_progress" }>;
+  }>;
+};
+
+export function selectEligibleBatch(
+  entries: QueueEntry[],
+  caps: PortfolioCaps,
+): PortfolioQueueClaimTarget[];
+
+export type PortfolioQueueManager = {
+  caps: PortfolioCaps;
+  store: PortfolioQueueStore;
+  dbPath: string;
+  enqueue(item: EnqueueItem): QueueEntry;
+  listQueue(repoFullName?: string | null): QueueEntry[];
+  markDone(repoFullName: string, identifier: string): QueueEntry | null;
+  claimNextBatch(): QueueEntry[];
+  close(): void;
+};
+
+export type InitPortfolioQueueManagerOptions = {
+  caps?: Partial<PortfolioCaps>;
+  store?: PortfolioQueueStore;
+  dbPath?: string;
+};
+
+export function initPortfolioQueueManager(options?: InitPortfolioQueueManagerOptions): PortfolioQueueManager;
+
+export function closeDefaultPortfolioQueueManager(): void;
diff --git a/packages/gittensory-miner/lib/portfolio-queue-manager.js b/packages/gittensory-miner/lib/portfolio-queue-manager.js
new file mode 100644
index 0000000000..ed7b8ba41a
--- /dev/null
+++ b/packages/gittensory-miner/lib/portfolio-queue-manager.js
@@ -0,0 +1,102 @@
+// Stateful PortfolioQueueManager (#4285): compose the persisted SQLite portfolio/queue store
+// (portfolio-queue.js, #2292) with the pure engine selector (nextEligibleItems, queue.ts, #2326) so batch
+// claiming respects global/per-repo WIP caps and cross-repo diversification instead of a naive priority-only
+// single-row dequeue. Caps are plain constructor arguments — not wired to .gittensory-miner.yml here.
+import { nextEligibleItems } from "@jsonbored/gittensory-engine";
+import { initPortfolioQueueStore } from "./portfolio-queue.js";
+
+const ITEM_ID_SEPARATOR = "::";
+
+/** Stable composite id for projecting SQLite rows into the engine's PortfolioQueueItem shape. */
+export function queueItemId(repoFullName, identifier) {
+  return `${repoFullName}${ITEM_ID_SEPARATOR}${identifier}`;
+}
+
+/** Reverse {@link queueItemId} after engine selection so claims can target SQLite primary keys. */
+export function parseQueueItemId(id) {
+  if (typeof id !== "string") throw new Error("invalid_queue_item_id");
+  const separatorIndex = id.indexOf(ITEM_ID_SEPARATOR);
+  if (separatorIndex <= 0 || separatorIndex === id.length - ITEM_ID_SEPARATOR.length) {
+    throw new Error("invalid_queue_item_id");
+  }
+  return {
+    repoFullName: id.slice(0, separatorIndex),
+    identifier: id.slice(separatorIndex + ITEM_ID_SEPARATOR.length),
+  };
+}
+
+/** Coerce caps to finite non-negative integers (mirrors the engine's normalizeCaps posture). */
+export function normalizePortfolioCaps(caps = {}) {
+  const globalWipCap = Number.isFinite(caps.globalWipCap) ? Math.max(0, Math.trunc(caps.globalWipCap)) : 0;
+  const perRepoWipCap = Number.isFinite(caps.perRepoWipCap) ? Math.max(0, Math.trunc(caps.perRepoWipCap)) : 0;
+  return { globalWipCap, perRepoWipCap };
+}
+
+/** Project persisted queue rows into the engine's in-memory PortfolioQueue (done rows omitted). Pure. */
+export function entriesToPortfolioQueue(entries) {
+  const activeEntries = Array.isArray(entries) ? entries.filter((entry) => entry?.status !== "done") : [];
+  const bucketsByRepo = new Map();
+  const bucketOrder = [];
+  for (const entry of activeEntries) {
+    const repoFullName = typeof entry.repoFullName === "string" ? entry.repoFullName.trim() : "";
+    const identifier = typeof entry.identifier === "string" ? entry.identifier.trim() : "";
+    if (!repoFullName || !identifier) continue;
+    const repoKey = repoFullName.toLowerCase();
+    if (!bucketsByRepo.has(repoKey)) {
+      bucketsByRepo.set(repoKey, []);
+      bucketOrder.push(repoKey);
+    }
+    bucketsByRepo.get(repoKey).push({
+      id: queueItemId(repoFullName, identifier),
+      repoFullName,
+      state: entry.status === "in_progress" ? "in_progress" : "queued",
+    });
+  }
+  return {
+    buckets: bucketOrder.map((repoFullName) => ({
+      repoFullName,
+      items: bucketsByRepo.get(repoFullName),
+    })),
+  };
+}
+
+/** Select the next eligible batch from active rows using the engine primitive. Pure. */
+export function selectEligibleBatch(entries, caps) {
+  const normalizedCaps = normalizePortfolioCaps(caps);
+  const queue = entriesToPortfolioQueue(entries);
+  return nextEligibleItems(queue, normalizedCaps).map((item) => parseQueueItemId(item.id));
+}
+
+/**
+ * Open a caps-aware portfolio queue manager backed by the local SQLite store. The existing single-row
+ * `dequeueNext()` CLI surface is untouched — this adds `claimNextBatch()` for fleet-style batch claiming.
+ */
+export function initPortfolioQueueManager(options = {}) {
+  const caps = normalizePortfolioCaps(options.caps ?? { globalWipCap: 1, perRepoWipCap: 1 });
+  const store = options.store ?? initPortfolioQueueStore(options.dbPath);
+
+  return {
+    caps,
+    store,
+    dbPath: store.dbPath,
+    enqueue(item) {
+      return store.enqueue(item);
+    },
+    listQueue(repoFullName) {
+      return store.listQueue(repoFullName);
+    },
+    markDone(repoFullName, identifier) {
+      return store.markDone(repoFullName, identifier);
+    },
+    claimNextBatch() {
+      return store.batchClaim((entries) => selectEligibleBatch(entries, caps));
+    },
+    close() {
+      store.close();
+    },
+  };
+}
+
+export function closeDefaultPortfolioQueueManager() {
+  // Reserved for symmetry with other miner stores; managers are opened explicitly today.
+}
diff --git a/packages/gittensory-miner/lib/portfolio-queue.d.ts b/packages/gittensory-miner/lib/portfolio-queue.d.ts
index 6fe17dab99..c1560421e5 100644
--- a/packages/gittensory-miner/lib/portfolio-queue.d.ts
+++ b/packages/gittensory-miner/lib/portfolio-queue.d.ts
@@ -20,6 +20,9 @@ export type PortfolioQueueStore = {
   dequeueNext(): QueueEntry | null;
   listQueue(repoFullName?: string | null): QueueEntry[];
   markDone(repoFullName: string, identifier: string): QueueEntry | null;
+  batchClaim(
+    selectFn: (entries: QueueEntry[]) => Array<{ repoFullName: string; identifier: string }>,
+  ): QueueEntry[];
   close(): void;
 };
 
diff --git a/packages/gittensory-miner/lib/portfolio-queue.js b/packages/gittensory-miner/lib/portfolio-queue.js
index a07adc5d9e..b59f4a27d0 100644
--- a/packages/gittensory-miner/lib/portfolio-queue.js
+++ b/packages/gittensory-miner/lib/portfolio-queue.js
@@ -133,6 +133,14 @@ export function initPortfolioQueueStore(dbPath = resolvePortfolioQueueDbPath())
   const listRepoStatement = db.prepare(
     `SELECT * FROM miner_portfolio_queue WHERE repo_full_name = ? ${ORDER}`,
   );
+  const listActiveStatement = db.prepare(
+    `SELECT * FROM miner_portfolio_queue WHERE status IN ('queued', 'in_progress') ${ORDER}`,
+  );
+  const claimTargetStatement = db.prepare(`
+    UPDATE miner_portfolio_queue SET status = 'in_progress'
+    WHERE repo_full_name = ? AND identifier = ? AND status = 'queued'
+    RETURNING *
+  `);
 
   return {
     dbPath: resolvedPath,
@@ -162,6 +170,31 @@ export function initPortfolioQueueStore(dbPath = resolvePortfolioQueueDbPath())
       const row = getStatement.get(normalizedRepo, normalizedIdentifier);
       return row ? rowToEntry(row) : null;
     },
+    /**
+     * Transactional caps-aware batch claim hook used by portfolio-queue-manager.js: re-read active rows under an
+     * exclusive lock, let the caller pick targets, then atomically flip each still-queued row to `in_progress`.
+     */
+    batchClaim(selectFn) {
+      if (typeof selectFn !== "function") throw new Error("invalid_batch_claim_selector");
+      db.exec("BEGIN IMMEDIATE");
+      try {
+        const entries = listActiveStatement.all().map(rowToEntry);
+        const targets = selectFn(entries);
+        if (!Array.isArray(targets)) throw new Error("invalid_batch_claim_selection");
+        const claimed = [];
+        for (const target of targets) {
+          const repoFullName = normalizeRepoFullName(target?.repoFullName);
+          const identifier = normalizeIdentifier(target?.identifier);
+          const row = claimTargetStatement.get(repoFullName, identifier);
+          if (row) claimed.push(rowToEntry(row));
+        }
+        db.exec("COMMIT");
+        return claimed;
+      } catch (error) {
+        db.exec("ROLLBACK");
+        throw error;
+      }
+    },
     close() {
       db.close();
     },
diff --git a/packages/gittensory-miner/package.json b/packages/gittensory-miner/package.json
index 91a2971093..e6cccab432 100644
--- a/packages/gittensory-miner/package.json
+++ b/packages/gittensory-miner/package.json
@@ -32,7 +32,7 @@
     "expected-engine.version"
   ],
   "scripts": {
-    "build": "node --check bin/gittensory-miner.js && node --check lib/version.js && node --check lib/cli.js && node --check lib/deny-check.js && node --check lib/run-state-cli.js && node --check lib/update-check.js && node --check lib/worktree-allocator.js && node --check lib/opportunity-fanout.js && node --check lib/ci-poller.js && node --check lib/run-state.js && node --check lib/deny-hooks.js && node --check lib/event-ledger.js && node --check lib/event-ledger-cli.js && node --check lib/claim-ledger.js && node --check lib/claim-ledger-expiry.js && node --check lib/claim-ledger-cli.js && node --check lib/claim-adjudication.js && node --check lib/portfolio-queue.js && node --check lib/portfolio-queue-cli.js && node --check lib/portfolio-discovery.js && node --check lib/opportunity-ranker.js && node --check lib/plan-store.js && node --check lib/plan-store-cli.js && node --check lib/rejection-templates.js && node --check lib/governor-ledger.js && node --check lib/governor-ledger-cli.js && node --check lib/manage-status.js && node --check lib/manage-poll.js && node --check lib/status.js && node --check lib/laptop-init.js && node --check lib/replay-objective-anchor.js && node --check lib/replay-task-generation.js && node --check lib/calibration-types.js && node --check lib/calibration.js"
+    "build": "node --check bin/gittensory-miner.js && node --check lib/version.js && node --check lib/cli.js && node --check lib/deny-check.js && node --check lib/run-state-cli.js && node --check lib/update-check.js && node --check lib/worktree-allocator.js && node --check lib/opportunity-fanout.js && node --check lib/ci-poller.js && node --check lib/run-state.js && node --check lib/deny-hooks.js && node --check lib/event-ledger.js && node --check lib/event-ledger-cli.js && node --check lib/claim-ledger.js && node --check lib/claim-ledger-expiry.js && node --check lib/claim-ledger-cli.js && node --check lib/claim-adjudication.js && node --check lib/portfolio-queue.js && node --check lib/portfolio-queue-cli.js && node --check lib/portfolio-queue-manager.js && node --check lib/portfolio-discovery.js && node --check lib/opportunity-ranker.js && node --check lib/plan-store.js && node --check lib/plan-store-cli.js && node --check lib/rejection-templates.js && node --check lib/governor-ledger.js && node --check lib/governor-ledger-cli.js && node --check lib/manage-status.js && node --check lib/manage-poll.js && node --check lib/status.js && node --check lib/laptop-init.js && node --check lib/replay-objective-anchor.js && node --check lib/replay-task-generation.js && node --check lib/calibration-types.js && node --check lib/calibration.js"
   },
   "dependencies": {
     "@jsonbored/gittensory-engine": ">=0.1.0 <1.0.0"
diff --git a/test/unit/miner-portfolio-queue-manager.test.ts b/test/unit/miner-portfolio-queue-manager.test.ts
new file mode 100644
index 0000000000..4e1b6471ce
--- /dev/null
+++ b/test/unit/miner-portfolio-queue-manager.test.ts
@@ -0,0 +1,116 @@
+import { afterEach, describe, expect, it } from "vitest";
+import {
+  entriesToPortfolioQueue,
+  initPortfolioQueueManager,
+  normalizePortfolioCaps,
+  parseQueueItemId,
+  queueItemId,
+  selectEligibleBatch,
+} from "../../packages/gittensory-miner/lib/portfolio-queue-manager.js";
+import { initPortfolioQueueStore, type QueueEntry } from "../../packages/gittensory-miner/lib/portfolio-queue.js";
+
+const stores: Array<{ close(): void }> = [];
+
+afterEach(() => {
+  while (stores.length > 0) stores.pop()?.close();
+});
+
+function memoryManager(caps: { globalWipCap: number; perRepoWipCap: number }) {
+  const store = initPortfolioQueueStore(":memory:");
+  stores.push(store);
+  return initPortfolioQueueManager({ store, caps });
+}
+
+describe("normalizePortfolioCaps() (#4285)", () => {
+  it("coerces caps to finite non-negative integers", () => {
+    expect(normalizePortfolioCaps({ globalWipCap: 2.9, perRepoWipCap: -1 })).toEqual({
+      globalWipCap: 2,
+      perRepoWipCap: 0,
+    });
+    expect(normalizePortfolioCaps()).toEqual({ globalWipCap: 0, perRepoWipCap: 0 });
+  });
+});
+
+describe("entriesToPortfolioQueue() / selectEligibleBatch() (#4285)", () => {
+  it("mirrors the engine diversification scenario through persisted row shapes", () => {
+    const entries: QueueEntry[] = [
+      { repoFullName: "acme/alpha", identifier: "a-running", priority: 0, status: "in_progress", enqueuedAt: "t1" },
+      { repoFullName: "acme/alpha", identifier: "a-queued-1", priority: 0, status: "queued", enqueuedAt: "t2" },
+      { repoFullName: "acme/alpha", identifier: "a-queued-2", priority: 0, status: "queued", enqueuedAt: "t3" },
+      { repoFullName: "acme/beta", identifier: "b-queued-1", priority: 0, status: "queued", enqueuedAt: "t4" },
+      { repoFullName: "acme/gamma", identifier: "c-queued-1", priority: 0, status: "queued", enqueuedAt: "t5" },
+    ];
+
+    expect(
+      selectEligibleBatch(entries, { globalWipCap: 4, perRepoWipCap: 2 }).map((target) => target.identifier),
+    ).toEqual(["b-queued-1", "c-queued-1", "a-queued-1"]);
+    expect(entriesToPortfolioQueue(entries).buckets.map((bucket) => bucket.repoFullName)).toEqual([
+      "acme/alpha",
+      "acme/beta",
+      "acme/gamma",
+    ]);
+    expect(parseQueueItemId(queueItemId("acme/beta", "b-queued-1"))).toEqual({
+      repoFullName: "acme/beta",
+      identifier: "b-queued-1",
+    });
+  });
+
+  it("returns nothing when either cap is zero", () => {
+    const entries: QueueEntry[] = [
+      { repoFullName: "acme/alpha", identifier: "x", priority: 0, status: "queued", enqueuedAt: "t1" },
+    ];
+    expect(selectEligibleBatch(entries, { globalWipCap: 0, perRepoWipCap: 1 })).toEqual([]);
+    expect(selectEligibleBatch(entries, { globalWipCap: 1, perRepoWipCap: 0 })).toEqual([]);
+  });
+});
+
+describe("initPortfolioQueueManager().claimNextBatch() (#4285)", () => {
+  it("returns an empty batch on an empty queue", () => {
+    const manager = memoryManager({ globalWipCap: 2, perRepoWipCap: 2 });
+    expect(manager.claimNextBatch()).toEqual([]);
+  });
+
+  it("respects a saturated per-repo cap", () => {
+    const manager = memoryManager({ globalWipCap: 4, perRepoWipCap: 1 });
+    manager.enqueue({ repoFullName: "acme/alpha", identifier: "running", priority: 1 });
+    manager.enqueue({ repoFullName: "acme/alpha", identifier: "queued-1", priority: 2 });
+    manager.enqueue({ repoFullName: "acme/alpha", identifier: "queued-2", priority: 3 });
+    expect(manager.store.dequeueNext()?.identifier).toBe("queued-2");
+
+    expect(manager.claimNextBatch().map((entry) => entry.identifier)).toEqual([]);
+    expect(manager.listQueue("acme/alpha").map((entry) => [entry.identifier, entry.status])).toEqual([
+      ["queued-2", "in_progress"],
+      ["queued-1", "queued"],
+      ["running", "queued"],
+    ]);
+  });
+
+  it("claims a diversified batch and leaves dequeueNext behavior unchanged for the CLI path", () => {
+    const manager = memoryManager({ globalWipCap: 4, perRepoWipCap: 2 });
+    manager.enqueue({ repoFullName: "acme/alpha", identifier: "a-running", priority: 5 });
+    manager.enqueue({ repoFullName: "acme/alpha", identifier: "a-queued-1", priority: 4 });
+    manager.enqueue({ repoFullName: "acme/alpha", identifier: "a-queued-2", priority: 3 });
+    manager.enqueue({ repoFullName: "acme/beta", identifier: "b-queued-1", priority: 2 });
+    manager.enqueue({ repoFullName: "acme/gamma", identifier: "c-queued-1", priority: 1 });
+    manager.store.dequeueNext(); // single-row CLI path still claims highest priority only
+
+    const claimed = manager.claimNextBatch();
+    expect(claimed.map((entry) => entry.identifier)).toEqual(["b-queued-1", "c-queued-1", "a-queued-1"]);
+    expect(claimed.every((entry) => entry.status === "in_progress")).toBe(true);
+    expect(manager.listQueue().find((entry) => entry.identifier === "a-queued-2")?.status).toBe("queued");
+  });
+
+  it("does not claim rows another writer already took inside the same transaction window", () => {
+    const store = initPortfolioQueueStore(":memory:");
+    stores.push(store);
+    store.enqueue({ repoFullName: "acme/alpha", identifier: "one", priority: 1 });
+    store.enqueue({ repoFullName: "acme/beta", identifier: "two", priority: 1 });
+
+    const claimed = store.batchClaim((entries) => {
+      store.dequeueNext();
+      return selectEligibleBatch(entries, { globalWipCap: 2, perRepoWipCap: 1 });
+    });
+
+    expect(claimed.map((entry) => entry.identifier)).toEqual(["two"]);
+  });
+});