Publish the page to GitHub Pages after every successful scan

[yanivil]

Summary

PR 3 of the website plan: publish the page at https://yanivil.github.io/SignalSync/ after every successful scan.

Workflow .github/workflows/pages.yml

• Triggers: workflow_run when daily-scan completes successfully (a push made with the workflow token, like the scan's commit of output/, never triggers other workflows, so the scan's completion is the trigger); pushes touching the page's files (site/, tools/build_site.py, tools/evaluate_signals.py, the workflow); manual dispatch. A failed scan leaves the previous build in place.
• build: checkout with history, tools/evaluate_signals.py --horizon 60 --json (the runner has the open internet the prices need), tools/build_site.py into _site/, configure-pages, upload-pages-artifact. Nothing is committed back.
• deploy: deploy-pages into the github-pages environment, on main only; a branch push builds without deploying, which is the smoke test. Permissions contents: read, pages: write, id-token: write; concurrency per ref; all actions SHA-pinned (configure-pages v6.0.0, upload-pages-artifact v5.0.0, deploy-pages v5.0.1).
• Pages is enabled on the repository with the GitHub Actions source (done through the API; the URL above is live once the first deploy from main runs).

Smoke test on this branch: run 34328987082 evaluated the six live signals, built the page (1 setup, 5 watchlist rows, 6 track-record rows) and uploaded the artifact; the deploy job was skipped as designed.

Docs: README (the page's URL and the layout entry), wiki 01 (scheduling diagram and the publishing bullet), wiki 04 (workflows table), a note in daily-scan.yml, changelog.

After the merge: the push to main touching the workflow triggers the first build and deploy; from then on every successful nightly scan republishes the page. The 08:45 e-mail task is untouched; retiring it or shrinking it to a one-line link is a separate decision.

Test plan

• branch smoke build (34328987082): evaluate, build, artifact upload; deploy skipped off main
• tests workflow on this PR
• first deploy from main after the merge, then open https://yanivil.github.io/SignalSync/

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