Pin @playwright/test 1.62.0 (matches the cached chromium
revision) and serve dist/ via python3 http.server, so the
deployed artifact is what gets tested. Covers page load,
terminal commands, vim mode, achievements, and the nav menu.
Ignore node_modules, test-results, playwright-report, and the
phased-execution runtime scratch (.agents/phase-sessions,
pipeline.log).
