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+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+//
+// The MERGED-ORDER pin for Setup → Integrations.
+//
+// ---------------------------------------------------------------------------
+// What this pins
+// ---------------------------------------------------------------------------
+// `SETUP_APP` declares `group_integrations` as an empty anchor (ADR-0029 D7);
+// every entry in it is contributed at runtime by the package that owns the
+// capability, and `SchemaRegistry.applyNavContributions` orders the
+// contributions by their `priority`, lowest first. Today that reads:
+//
+//   Webhooks / HTTP Deliveries   `@objectstack/plugin-webhooks`
+//   Datasources                  `@objectstack/service-datasource`
+//   Connect an Agent             `@objectstack/mcp`
+//   Connector Credentials        `@objectstack/service-automation`
+//   Cloud Connection             `@objectstack/cloud-connection`
+//
+// Each contributor states the group's other priorities in its own header so
+// that its number sorts where it means to — and nothing held those headers to
+// the code. A later contributor could renumber one of the five and silently
+// reorder the menu an administrator reads. This file is that hold.
+//
+// ⛔ The priorities are READ from the real contributions, never copied here as
+// literals: a pin that restated `110` / `120` would pass beside a source that
+// had moved, as long as nobody re-ran the arithmetic. What the file does state
+// is the ORDER of the ids, which is the user-visible fact under protection.
+//
+// The first two contributors share one priority, so the fold's stable sort
+// leaves their relative order to registration order, which belongs to the
+// composition root's plugin list and not to any priority. That tier is pinned
+// as a set; every tier boundary is pinned as an order.
+//
+// ---------------------------------------------------------------------------
+// Why it lives in `packages/cli/test/`
+// ---------------------------------------------------------------------------
+// The same reason as `connect-agent-both-halves-wire.pin.test.ts` beside it:
+// this is a COMPOSED fact across five packages and the registry fold, and
+// `packages/cli` is the only workspace package that depends on all of them.
+//
+// Two of the five register their contribution from inside `init()` through
+// the `manifest` service rather than exporting it, so they are booted here on
+// a context that serves exactly that service — the shape
+// `packages/cli/scripts/check-app-nav-i18n.mjs` boots the same two with.
+// `@objectstack/service-automation` registers its bundle at `kernel:ready`,
+// which this context never fires, so its exported bundle is read directly, as
+// that gate does too.
+
+import { describe, expect, it } from 'vitest';
+import { CLOUD_CONNECTION_UI_BUNDLE } from '@objectstack/cloud-connection';
+import { CONNECT_AGENT_UI_BUNDLE } from '@objectstack/mcp';
+import { SchemaRegistry } from '@objectstack/objectql';
+import { SETUP_APP, SETUP_NAV_CONTRIBUTIONS } from '@objectstack/platform-objects/apps';
+import { WebhookOutboxPlugin } from '@objectstack/plugin-webhooks';
+import { CONNECTOR_CREDENTIALS_UI_BUNDLE } from '@objectstack/service-automation';
+import { DatasourceAdminServicePlugin } from '@objectstack/service-datasource';
+
+type AnyRec = Record<string, any>;
+
+const GROUP = 'group_integrations';
+
+/**
+ * The group, in the order an administrator reads it. Each inner array is one
+ * priority tier; ids inside a tier are compared as a set (see the header).
+ */
+const EXPECTED_TIERS: readonly (readonly string[])[] = [
+    ['nav_webhooks', 'nav_http_deliveries', 'nav_datasources'],
+    ['nav_connect_agent'],
+    ['nav_connector_credentials'],
+    ['nav_cloud_connection'],
+];
+
+/**
+ * The manifests a plugin registers from `init()`, captured off a context that
+ * serves the `manifest` service and inert, complete stand-ins for the rest of
+ * the interface (`packages/core/src/types.ts`), so a missing member cannot be
+ * misread as a plugin that contributes nothing.
+ */
+async function manifestsRegisteredBy(plugin: { init(ctx: any): Promise<void> | void }): Promise<AnyRec[]> {
+    const manifests: AnyRec[] = [];
+    const ctx = {
+        getService: (name: string) => (name === 'manifest' ? { register: (m: AnyRec) => manifests.push(m) } : undefined),
+        registerService: () => {},
+        registerServiceFactory: () => {},
+        replaceService: () => {},
+        getServiceScoped: async () => undefined,
+        getServices: () => new Map(),
+        hook: () => {},
+        trigger: async () => {},
+        logger: { info: () => {}, warn: () => {}, error: () => {}, debug: () => {} },
+        getKernel: () => undefined,
+    };
+    await plugin.init(ctx);
+    return manifests;
+}
+
+/** Every Setup contribution the composition carries, tagged with its package. */
+async function setupContributions(): Promise<Array<{ packageId: string; contribution: AnyRec }>> {
+    const sources: Array<[string, AnyRec[]]> = [
+        ['@objectstack/plugin-webhooks', await manifestsRegisteredBy(new WebhookOutboxPlugin({ autoEnqueue: false }))],
+        ['@objectstack/service-datasource', await manifestsRegisteredBy(new DatasourceAdminServicePlugin({}) as any)],
+        ['@objectstack/mcp', [CONNECT_AGENT_UI_BUNDLE as AnyRec]],
+        ['@objectstack/service-automation', [CONNECTOR_CREDENTIALS_UI_BUNDLE as AnyRec]],
+        ['@objectstack/cloud-connection', [CLOUD_CONNECTION_UI_BUNDLE as AnyRec]],
+    ];
+    const out: Array<{ packageId: string; contribution: AnyRec }> = SETUP_NAV_CONTRIBUTIONS.map((contribution) => ({
+        packageId: '@objectstack/platform-objects',
+        contribution: contribution as AnyRec,
+    }));
+    for (const [packageId, manifests] of sources) {
+        for (const manifest of manifests) {
+            for (const contribution of manifest?.navigationContributions ?? []) {
+                if (contribution?.app === 'setup') out.push({ packageId, contribution });
+            }
+        }
+    }
+    return out;
+}
+
+/** The children of one nav group in the merged app, by id. */
+function groupChildren(app: AnyRec | undefined, groupId: string): string[] {
+    const group = (app?.navigation ?? []).find((item: AnyRec) => item?.id === groupId);
+    return (group?.children ?? []).map((child: AnyRec) => String(child?.id));
+}
+
+describe('Setup → Integrations: the merged order follows each contributor\'s priority', () => {
+    it('serves the five contributors in priority order, read from the contributions themselves', async () => {
+        const contributions = await setupContributions();
+
+        // `structuredClone`: `registerApp` writes the `_lock` envelope onto
+        // what it is handed (ADR-0010 §3.7); the module constant stays clean.
+        const registry = new SchemaRegistry({ multiTenant: false, collisionPolicy: 'error' });
+        (registry as AnyRec).logLevel = 'silent';
+        registry.registerApp(structuredClone(SETUP_APP), '@objectstack/platform-objects');
+        for (const { packageId, contribution } of contributions) {
+            registry.registerAppNavContribution(contribution as any, packageId);
+        }
+
+        const merged = groupChildren(registry.getApp('setup'), GROUP);
+
+        // ── The order an administrator reads ──────────────────────────────
+        expect(merged).toHaveLength(EXPECTED_TIERS.flat().length);
+        let offset = 0;
+        for (const tier of EXPECTED_TIERS) {
+            expect(new Set(merged.slice(offset, offset + tier.length))).toEqual(new Set(tier));
+            offset += tier.length;
+        }
+
+        // ── The priorities behind it, read where they are declared ────────
+        // Every id in the group, mapped to the priority of the contribution
+        // that carries it — and to that contribution's package, so a red names
+        // who moved.
+        const declared = new Map<string, { priority: number; packageId: string }>();
+        for (const { packageId, contribution } of contributions) {
+            if (contribution.group !== GROUP) continue;
+            for (const item of contribution.items ?? []) {
+                declared.set(String(item.id), { priority: contribution.priority, packageId });
+            }
+        }
+        // Nothing contributes into the group that this pin does not order.
+        expect([...declared.keys()].sort()).toEqual([...EXPECTED_TIERS.flat()].sort());
+
+        const tierPriority = EXPECTED_TIERS.map((tier) => {
+            const priorities = new Set(tier.map((id) => declared.get(id)?.priority));
+            expect(priorities.size, `${tier.join(', ')} share one priority`).toBe(1);
+            const [priority] = priorities;
+            expect(typeof priority, `${tier.join(', ')} declare a numeric priority`).toBe('number');
+            return { tier, priority: priority as number };
+        });
+        for (let i = 1; i < tierPriority.length; i += 1) {
+            const before = tierPriority[i - 1];
+            const after = tierPriority[i];
+            const owner = (id: string) => declared.get(id)?.packageId;
+            expect(
+                before.priority < after.priority,
+                `${before.tier[0]} (${owner(before.tier[0])}, ${before.priority}) sorts before ` +
+                    `${after.tier[0]} (${owner(after.tier[0])}, ${after.priority})`,
+            ).toBe(true);
+        }
+    });
+});