fix(e2e): align browser harness with local stack

e2e/specs/admin.spec.ts

@@ -1,6 +1,7 @@
 import { expect, test } from '@playwright/test';
 
-const admin = process.env.ADMIN_URL ?? 'http://127.0.0.1:3001';
+const admin = process.env.ADMIN_URL;
+if (!admin) throw new Error('Run E2E through npm run verify:e2e');
 
 test('unauthenticated admin access reaches the real login boundary', async ({ page }) => {
   await page.goto(admin);

e2e/specs/mcp.spec.ts

@@ -1,6 +1,7 @@
 import { expect, test } from '@playwright/test';
 
-const mcp = process.env.MCP_URL ?? 'http://127.0.0.1:3002';
+const mcp = process.env.MCP_URL;
+if (!mcp) throw new Error('Run E2E through npm run verify:e2e');
 
 test('MCP health is available while tool access requires auth', async ({ request }) => {
   const health = await request.get(`${mcp}/health`);

e2e/specs/web.spec.ts

@@ -1,7 +1,8 @@
 import { expect, test } from '@playwright/test';
-import { createRedemptionFixture } from '../helpers/local-supabase';
+import { createRedemptionFixture } from '../helpers/local-postgres';
 
-const web = process.env.WEB_URL ?? 'http://127.0.0.1:3000';
+const web = process.env.WEB_URL;
+if (!web) throw new Error('Run E2E through npm run verify:e2e');
 
 test('marketing home renders the primary product journey', async ({ page }) => {
   await page.goto(web);
@@ -27,17 +28,8 @@ test('redemption updates server state and visible product state', async ({ page
     await expect(page.getByRole('heading', { name: 'Code Redeemed!' })).toBeVisible();
     await expect(page.getByText(fixture.email)).toBeVisible();
 
-    const { data: profile, error: profileError } = await fixture.client
-      .from('profiles').select('is_premium').eq('id', fixture.userId).single();
-    expect(profileError).toBeNull();
-    expect(profile?.is_premium).toBe(true);
-    const { count, error: redemptionError } = await fixture.client
-      .from('code_redemptions').select('*', { count: 'exact', head: true })
-      .eq('code_id', fixture.codeId).eq('user_id', fixture.userId);
-    expect(redemptionError).toBeNull();
-    expect(count).toBe(1);
+    await expect(fixture.assertRedeemed()).resolves.toBeUndefined();
   } finally {
-    await fixture.client.auth.admin.deleteUser(fixture.userId);
-    await fixture.client.from('redemption_codes').delete().eq('id', fixture.codeId);
+    await fixture.cleanup();
   }
 });