Add enterprise appliance experience Phase 1 foundation

tests/browser/README.md

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+# Browser Journey and Accessibility Tests
+
+Browser tests MUST run against a disposable local or appliance target, never a production customer.
+
+Required coverage:
+
+- supported desktop browser viewport plus 200% zoom/reflow;
+- keyboard-only primary and failure/recovery journeys;
+- visible focus, logical order, accessible names, headings and landmarks;
+- dynamic status, progress, validation and completion announcements;
+- loading, empty, ready, degraded, failed, restricted, unavailable and stale states;
+- 1-second navigation feedback and 2-second operation acknowledgement trials;
+- screenshots and machine-readable results stored outside source control.
+
+The final browser runner and dependency versions MUST be pinned when implementation selects them.
+Automated accessibility results never replace the manual WCAG 2.2 AA checklist.