Wire createCommission() into compliance batch checkout

Compliance batch orders now create commission ledger entries when
a discount code (agent referral) is used. Tracks total order amount,
discount applied, and links to the agent for payout processing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/src/routes/checkout.ts

@@ -1493,6 +1493,34 @@ export async function handlePaymentComplete(
     } catch (err) {
       console.error(`[checkout] Batch ${batchId}: failed to load sub-orders:`, err);
     }
+
+    // ── Commission tracking for compliance batch orders ─────────────────
+    try {
+      const discRow = await pool.query(
+        `SELECT DISTINCT discount_code FROM compliance_orders WHERE batch_id = $1 AND discount_code IS NOT NULL LIMIT 1`,
+        [batchId],
+      );
+      const discountCode = discRow.rows[0]?.discount_code as string | null;
+      if (discountCode) {
+        const { createCommission } = await import("./agents.js");
+        const totalCents = (updated.rows as any[]).reduce((sum, r) =>
+          sum + (Number(r.service_fee_cents) || 0) + (Number(r.gov_fee_cents) || 0) - (Number(r.discount_cents) || 0), 0);
+        await createCommission({
+          agentCode: discountCode,
+          orderType: "service",
+          orderId: 0,
+          orderNumber: batchId,
+          serviceSlug: "compliance-batch",
+          customerName: (order.customer_name as string) || "",
+          customerEmail: (order.customer_email as string) || "",
+          orderAmountCents: totalCents,
+          discountCents: (updated.rows as any[]).reduce((sum, r) => sum + (Number(r.discount_cents) || 0), 0),
+        });
+        console.log(`[checkout] Commission created for batch ${batchId} via ${discountCode}`);
+      }
+    } catch (commErr) {
+      console.warn("[checkout] Commission creation failed (non-fatal):", commErr);
+    }
   }
 
   // ── Advance compliance order workflow (queues document generation) ────────