Deploy the hosted demo to Vercel

[Bruce1508]

Summary

• Add apps/web/vercel.json: static-site (framework: null), build:demo, out/, cleanUrls: true so the exported dynamic routes (investigations/<id>.html, evaluations/<id>.html) resolve without extensions.
• Live at https://rootlens-demo.vercel.app — verified: home, both investigation detail pages, the evaluation detail page, and /demo/manifest.json all return 200; demo banner renders.
• README: replace the stale "no hosted demo" claim with a link to the live demo, and correct the frontend unit test count (22 → 28, per the merged hosted-demo PR).

Task 7 from the hosted-demo plan (docs/superpowers/plans/2026-09-11-hosted-demo.md). Portfolio link-up is a separate PR in the Portfolio repo.

Test plan

• curl smoke test: /, both investigation detail routes, evaluation detail route, /demo/manifest.json — all 200
• Demo banner text ("read-only demo") present on the live page
• Investigation detail page renders real captured content (not a 404/blank shell)

🤖 Generated with Claude Code

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