feat: initial Playwright smoke suite

20 tests across 5 files covering all plugin surfaces on staging:
- Homepage load and PHP fatal detection
- Reconstitution Calculator shortcode + math
- Peptide Search AI widget + AJAX response
- Admin: all plugins active, PSA + PRAutoBlogger settings pages
- REST API: prc/v1/presets, peptides/v1/search, compounds, CPT types

Staging shortcode pages:
  /reconstitution-calculator/ - [prc_calculator]
  /search-peptides/           - [peptide_search]
  /peptide-directory/         - [peptide_directory]

GHA workflow: smoke.yml supports manual dispatch + workflow_call
for use as a deploy gate from plugin repos.

tests/03-admin-plugins.spec.ts

@@ -0,0 +1,100 @@
+/**
+ * 03-admin-plugins.spec.ts
+ *
+ * What: Verifies all five peptiderepo plugins are active in wp-admin and
+ *       their admin pages load without PHP errors. Catches activation failures
+ *       or missing plugin files after a deploy.
+ * Who triggers it: Playwright chromium project (post-auth setup).
+ * Dependencies: wp-admin authenticated session (from global.setup.ts).
+ *
+ * Plugin admin page slugs:
+ *   - peptide-search-ai       → ?page=peptide-search-ai
+ *   - pr-autoblogger          → ?page=pr-autoblogger
+ *   - peptide-repo-core       → ?page=peptide-repo-core  (if admin page exists)
+ *
+ * @see C:\Users\ongte\apps\Peptide Repo CTO\app-maps\
+ */
+
+import { test, expect } from '@playwright/test';
+
+const ADMIN = '/wp-admin';
+const PLUGINS_PAGE = `${ADMIN}/plugins.php`;
+
+// All five plugin slugs as WordPress registers them (directory name)
+const REQUIRED_PLUGINS = [
+  'peptide-search-ai',
+  'peptide-repo-core',
+  'peptide-reconstitution-calculator',
+  'pr-autoblogger',
+  'peptide-starter-theme', // theme, shown differently — checked separately
+];
+
+test.describe('WP Admin — Plugin health', () => {
+  test('plugins page loads without fatal error', async ({ page }) => {
+    const res = await page.goto(PLUGINS_PAGE);
+    expect(res?.status()).toBe(200);
+    await expect(page.locator('#wpbody')).toBeVisible();
+    const body = await page.textContent('body');
+    expect(body).not.toContain('Fatal error');
+  });
+
+  test('all required plugins are active', async ({ page }) => {
+    await page.goto(PLUGINS_PAGE);
+
+    for (const slug of REQUIRED_PLUGINS.filter((s) => s !== 'peptide-starter-theme')) {
+      // Active plugins have tr with class "active" and data-slug matching the plugin
+      const row = page.locator(`tr[data-slug="${slug}"]`);
+      if (await row.count() === 0) {
+        // Plugin may be in a subfolder — try partial match
+        const anyRow = page.locator(`tr[data-plugin*="${slug}"]`);
+        await expect(anyRow).toHaveCount(1, {
+          timeout: 5_000,
+        }).catch(() => {
+          throw new Error(`Plugin row not found for slug: ${slug}`);
+        });
+        await expect(anyRow.first()).toHaveClass(/active/);
+      } else {
+        await expect(row).toHaveClass(/active/, { timeout: 5_000 });
+      }
+    }
+  });
+});
+
+test.describe('WP Admin — PSA settings page', () => {
+  test('PSA settings page loads', async ({ page }) => {
+    const res = await page.goto(`${ADMIN}/admin.php?page=peptide-search-ai`);
+    expect(res?.status()).toBe(200);
+    await expect(page.locator('#wpbody')).toBeVisible();
+    const body = await page.textContent('body');
+    expect(body).not.toContain('Fatal error');
+    // Settings form must be present
+    await expect(page.locator('form')).toBeVisible();
+  });
+
+  test('PSA settings page shows cost dashboard section', async ({ page }) => {
+    await page.goto(`${ADMIN}/admin.php?page=peptide-search-ai`);
+    // Cost tracking dashboard renders on the same page
+    const dashboard = page.locator(
+      '.psa-cost-dashboard, [id*="cost"], [class*="usage"], table'
+    ).first();
+    await expect(dashboard).toBeVisible({ timeout: 10_000 });
+  });
+});
+
+test.describe('WP Admin — PRAutoBlogger settings page', () => {
+  test('PRAutoBlogger settings page loads', async ({ page }) => {
+    // Real slug confirmed via live inspection: prautoblogger-settings
+    const res = await page.goto(`${ADMIN}/admin.php?page=prautoblogger-settings`);
+    expect(res?.status()).toBe(200);
+    await expect(page.locator('#wpbody')).toBeVisible();
+    const body = await page.textContent('body');
+    expect(body).not.toContain('Fatal error');
+    // PRAutoBlogger uses a tabbed dashboard, not a plain <form>
+    await expect(page.locator('.prautoblogger-dashboard, h1, h2').first()).toBeVisible();
+  });
+});
+
+test.describe('WP Admin — Peptide Repo Core admin', () => {
+  test('PR Core menu item exists in wp-admin', async ({ page }) => {
+    await page.goto(`${ADMIN}/`);
+    // PR Core registers the peptide CPT which creates a "Peptides" menu item