Add GitHub Pages deployment workflow with concurrency control

[Copilot]

Deployments were being cancelled with "Canceling since a higher priority waiting request for pages build and deployment @ main exists" due to the default Pages concurrency behavior cancelling older queued builds.

• Added .github/workflows/deploy.yml using the standard Pages deployment actions with cancel-in-progress: false to queue deployments sequentially instead of cancelling them

concurrency:
  group: "pages"
  cancel-in-progress: false

Post-merge action required: In repo Settings → Pages → Source, switch from "Deploy from a branch" to "GitHub Actions".

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