Board admin smoke: assert prautoblogger-board renders for admin (#13)

Guards the submenu-before-parent 404 class in the deploy gate.
QA: APPROVE-W-P2 qa-reviews/peptide-e2e/2026-06-12-113bb17.md

Agent-Session: cto-board-404-hotfix-merge-20260612

CHANGELOG.md

@@ -0,0 +1,21 @@
+# Changelog
+
+All notable changes to the peptide-e2e smoke suite will be documented here.
+
+## [1.1.0] - 2026-06-12
+
+### Added
+- **Board page smoke test** (`03-admin-plugins.spec.ts` — `WP Admin — PRAutoBlogger board page`).
+  Navigates to `/wp-admin/admin.php?page=prautoblogger-board`, asserts HTTP 200,
+  `#prab-board` container visible, and body does NOT contain "Invalid plugin page".
+  Guards against the v0.19.1 regression class: Board submenu registered before parent
+  menu existed (both at admin_menu priority 10) → WordPress fallback hookname →
+  wp_die 404. Now in the deploy-gate smoke suite so this failure class is un-shippable.
+
+  Note: cannot be validated against prod until v0.19.1 of PRAutoBlogger deploys.
+  Spec compiles and lists cleanly under `npx playwright test --list`.
+
+## [1.0.0] - 2026-06-11
+
+Initial release. 21 tests across 5 specs: homepage, reconstitution calculator,
+peptide search, admin plugins, REST API.