Closes P1 #10 step 2. Adds @playwright/test@^1.60.0, playwright.config.js (CI fail-loud / dev warn-and-continue for missing VERCEL_AUTOMATION_BYPASS_SECRET, two projects partitioned by testMatch, snapshotPathTemplate aligned with workflow upload path), tests/visual/homepage.spec.ts (1 test, no baseline committed per architect Boot-the-brief Finding 7), 3 npm scripts, and 3 .gitignore entries. Smoke tests now run end-to-end against Vercel preview with x-vercel-protection-bypass header: 3/3 passed in 2.9s, total workflow 59s. Zero secret leaks in log. PR #18 architect-commit 3ac527e, implementer-commit c72d006.
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