diff --git a/tests/integration/integration-wiring.test.mjs b/tests/integration/integration-wiring.test.mjs
new file mode 100644
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+++ b/tests/integration/integration-wiring.test.mjs
@@ -0,0 +1,251 @@
+/**
+ * Integration Wiring Verification Tests
+ *
+ * Validates that backend modules are correctly wired into the proxy pipeline,
+ * API routes exist, and barrel exports are accessible.
+ *
+ * @module tests/integration/integration-wiring.test.mjs
+ */
+
+import { describe, it } from "node:test";
+import assert from "node:assert/strict";
+import { readFileSync, existsSync } from "node:fs";
+import { join, dirname } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const ROOT = join(__dirname, "..", "..");
+
+// ─── Helpers ─────────────────────────────────────────
+
+function readSrc(relPath) {
+  const full = join(ROOT, "src", relPath);
+  if (!existsSync(full)) return null;
+  return readFileSync(full, "utf8");
+}
+
+// ─── Pipeline Wiring (Batch 1) ──────────────────────
+
+describe("Pipeline Wiring — server-init.js", () => {
+  const src = readSrc("server-init.js");
+
+  it("should import initAuditLog from compliance", () => {
+    assert.ok(src, "server-init.js should exist");
+    assert.match(src, /initAuditLog/);
+  });
+
+  it("should call cleanupExpiredLogs", () => {
+    assert.match(src, /cleanupExpiredLogs/);
+  });
+
+  it("should log server.start audit event", () => {
+    assert.match(src, /server\.start/);
+  });
+});
+
+describe("Pipeline Wiring — chat.js", () => {
+  const src = readSrc("sse/handlers/chat.js");
+
+  it("should import compliance/sanitization", () => {
+    assert.ok(src, "chat.js should exist");
+    assert.match(src, /sanitize|compliance|logAuditEvent/);
+  });
+
+  it("should import circuitBreaker", () => {
+    assert.match(src, /circuitBreaker|getCircuitBreaker/);
+  });
+
+  it("should import modelAvailability", () => {
+    assert.match(src, /isModelAvailable|modelAvailability/);
+  });
+
+  it("should import requestTelemetry", () => {
+    assert.match(src, /RequestTelemetry|requestTelemetry/);
+  });
+
+  it("should import costRules", () => {
+    assert.match(src, /checkBudget|recordCost/);
+  });
+
+  it("should use generateRequestId", () => {
+    assert.match(src, /generateRequestId/);
+  });
+});
+
+describe("Pipeline Wiring — proxy.js", () => {
+  const src = readSrc("proxy.js");
+
+  it("should import fetchWithTimeout", () => {
+    assert.ok(src, "proxy.js should exist");
+    assert.match(src, /fetchWithTimeout/);
+  });
+
+  it("should import requestId utilities", () => {
+    assert.match(src, /generateRequestId|addRequestIdHeader/);
+  });
+});
+
+// ─── API Routes (Batch 2) ───────────────────────────
+
+describe("API Routes — existence check", () => {
+  const routes = [
+    "app/api/cache/stats/route.js",
+    "app/api/models/availability/route.js",
+    "app/api/telemetry/summary/route.js",
+    "app/api/usage/budget/route.js",
+    "app/api/fallback/chains/route.js",
+    "app/api/compliance/audit-log/route.js",
+    "app/api/evals/route.js",
+    "app/api/evals/[suiteId]/route.js",
+    "app/api/policies/route.js",
+  ];
+
+  for (const route of routes) {
+    it(`route file should exist: ${route}`, () => {
+      const full = join(ROOT, "src", route);
+      assert.ok(existsSync(full), `${route} should exist`);
+    });
+  }
+});
+
+describe("API Routes — export HTTP methods", () => {
+  it("/api/cache/stats should export GET and DELETE", () => {
+    const src = readSrc("app/api/cache/stats/route.js");
+    assert.match(src, /export\s+(async\s+)?function\s+GET/);
+    assert.match(src, /export\s+(async\s+)?function\s+DELETE/);
+  });
+
+  it("/api/models/availability should export GET and POST", () => {
+    const src = readSrc("app/api/models/availability/route.js");
+    assert.match(src, /export\s+(async\s+)?function\s+GET/);
+    assert.match(src, /export\s+(async\s+)?function\s+POST/);
+  });
+
+  it("/api/telemetry/summary should export GET", () => {
+    const src = readSrc("app/api/telemetry/summary/route.js");
+    assert.match(src, /export\s+(async\s+)?function\s+GET/);
+  });
+
+  it("/api/usage/budget should export GET and POST", () => {
+    const src = readSrc("app/api/usage/budget/route.js");
+    assert.match(src, /export\s+(async\s+)?function\s+GET/);
+    assert.match(src, /export\s+(async\s+)?function\s+POST/);
+  });
+
+  it("/api/fallback/chains should export GET, POST, DELETE", () => {
+    const src = readSrc("app/api/fallback/chains/route.js");
+    assert.match(src, /export\s+(async\s+)?function\s+GET/);
+    assert.match(src, /export\s+(async\s+)?function\s+POST/);
+    assert.match(src, /export\s+(async\s+)?function\s+DELETE/);
+  });
+
+  it("/api/evals should export GET and POST", () => {
+    const src = readSrc("app/api/evals/route.js");
+    assert.match(src, /export\s+(async\s+)?function\s+GET/);
+    assert.match(src, /export\s+(async\s+)?function\s+POST/);
+  });
+
+  it("/api/policies should export GET and POST", () => {
+    const src = readSrc("app/api/policies/route.js");
+    assert.match(src, /export\s+(async\s+)?function\s+GET/);
+    assert.match(src, /export\s+(async\s+)?function\s+POST/);
+  });
+});
+
+// ─── Barrel Exports (Batch 3) ───────────────────────
+
+describe("Barrel Exports — shared/components", () => {
+  const src = readSrc("shared/components/index.js");
+
+  const expected = [
+    "Breadcrumbs",
+    "EmptyState",
+    "NotificationToast",
+    "FilterBar",
+    "ColumnToggle",
+    "DataTable",
+  ];
+
+  for (const name of expected) {
+    it(`should export ${name}`, () => {
+      assert.ok(src, "shared/components/index.js should exist");
+      assert.match(src, new RegExp(name));
+    });
+  }
+});
+
+describe("Barrel Exports — store", () => {
+  const src = readSrc("store/index.js");
+
+  it("should export useNotificationStore", () => {
+    assert.ok(src, "store/index.js should exist");
+    assert.match(src, /useNotificationStore/);
+  });
+});
+
+// ─── Layout Integration (Batch 3) ──────────────────
+
+describe("DashboardLayout Integration", () => {
+  const src = readSrc("shared/components/layouts/DashboardLayout.js");
+
+  it("should import NotificationToast", () => {
+    assert.ok(src, "DashboardLayout.js should exist");
+    assert.match(src, /NotificationToast/);
+  });
+
+  it("should import Breadcrumbs", () => {
+    assert.match(src, /Breadcrumbs/);
+  });
+});
+
+// ─── Page Integration (Batch 4) ────────────────────
+
+describe("Page Integration — new components exist", () => {
+  const components = [
+    "app/(dashboard)/dashboard/usage/components/BudgetTelemetryCards.js",
+    "app/(dashboard)/dashboard/settings/components/ComplianceTab.js",
+    "app/(dashboard)/dashboard/settings/components/CacheStatsCard.js",
+  ];
+
+  for (const comp of components) {
+    it(`component should exist: ${comp.split("/").pop()}`, () => {
+      const full = join(ROOT, "src", comp);
+      assert.ok(existsSync(full), `${comp} should exist`);
+    });
+  }
+});
+
+describe("Page Integration — Usage page wiring", () => {
+  const src = readSrc("app/(dashboard)/dashboard/usage/page.js");
+
+  it("should import BudgetTelemetryCards", () => {
+    assert.ok(src, "usage/page.js should exist");
+    assert.match(src, /BudgetTelemetryCards/);
+  });
+});
+
+describe("Page Integration — Settings page wiring", () => {
+  const src = readSrc("app/(dashboard)/dashboard/settings/page.js");
+
+  it("should import ComplianceTab", () => {
+    assert.ok(src, "settings/page.js should exist");
+    assert.match(src, /ComplianceTab/);
+  });
+
+  it("should import CacheStatsCard", () => {
+    assert.match(src, /CacheStatsCard/);
+  });
+
+  it("should have compliance tab entry", () => {
+    assert.match(src, /compliance/i);
+  });
+});
+
+describe("Page Integration — Combos page EmptyState", () => {
+  const src = readSrc("app/(dashboard)/dashboard/combos/page.js");
+
+  it("should import EmptyState", () => {
+    assert.ok(src, "combos/page.js should exist");
+    assert.match(src, /EmptyState/);
+  });
+});