feat: scope localStorage per visitor for Cloudflare Pages demo

[evanoseen]

Closes #186

Live demo deployed at https://csf-profile.pages.dev

Changes:

• Scoped localStorage keys per visitor using a random ID to prevent cross-contamination between demo users
• Added _redirects file for Cloudflare Pages SPA routing
• Added live demo link to README

[CPAtoCybersecurity]

Hey @evanoseen, please resolve the conflicts on this one when you get a chance. Branch is 8 commits behind main, and the 3 conflicting store files (artifactStore.js, assessmentsStore.js, findingsStore.js) had additive changes land on main after this branch was cut — in each, we want both sides: your scopedKey wrap and the new state/methods on main.

git fetch origin
git checkout 186-deploy-a-public-live-demo-to-cloudflare-pages
git rebase origin/main
# resolve each file → git add <file> → git rebase --continue
git push --force-with-lease

Use --force-with-lease, not plain --force. After the rebase, build locally and confirm the demo still works. If any conflict looks ambiguous, drop a comment here before committing — happy to walk through it. Let's land this one before #193.

[evanoseen]

Rebase is done and conflicts are resolved (scopedKey wrap kept, version numbers from main kept — v6/v9/v4). Force-push is blocked by a branch protection rule on this branch. Can you temporarily allow force-push to 186-deploy-a-public-live-demo-to-cloudflare-pages so I can push the rebased commits?