Wire zappier-edge into the live stack and add billing department APIs

Fleet now spawns the real zappier and middleware processes. Metered
timestamp/receipt/hash calls proxy to middleware when ZAPPIER_UPSTREAM
is set. CS credits, sales per-customer pricing, and QuickBooks export
are separate repos plugged into zappier-edge admin.

packages/verae-fleet/test/fleet.test.js

@@ -1,7 +1,7 @@
 import { describe, it, after } from 'node:test';
 import assert from 'node:assert/strict';
 import { loadFleet, listServices, FLEET_ROOT } from '../src/load.js';
-import { Supervisor } from '../src/supervisor.js';
+import { Supervisor, spawnLocal } from '../src/supervisor.js';
 import { Monitor } from '../src/monitor.js';
 
 function treeOnly(healthBase) {
@@ -32,6 +32,20 @@ describe('verae-fleet', () => {
     for (const s of supervisors) await s.stopAll();
   });
 
+  it('spawnLocal runs spawn.command instead of the stub worker', async () => {
+    const child = spawnLocal(
+      FLEET_ROOT,
+      { spawn: { command: process.execPath, args: ['-e', 'process.stdout.write("ok"); process.exit(0)'] } },
+      { ...process.env },
+      9,
+    );
+    const out = [];
+    child.stdout.on('data', (c) => out.push(c));
+    const code = await new Promise((resolve) => child.on('exit', resolve));
+    assert.equal(code, 0);
+    assert.equal(Buffer.concat(out).toString(), 'ok');
+  });
+
   it('lists every service with a config file and central replica spec', () => {
     const loaded = loadFleet();
     const rows = listServices(loaded);
@@ -39,6 +53,9 @@ describe('verae-fleet', () => {
     for (const need of [
       'nats',
       'zappier-edge',
+      'customer-service',
+      'sales-pricing',
+      'accounting-export',
       'middleware-http',
       'job-poller',
       'webhook-deliver',