[squad:plan] Lumen Loom build, CI and deploy pipeline (McManus) #65582

Owner: McManus.

• Set up the TypeScript build and lint.
• Set up CI that runs tests.
• Set up static web deployment (GitHub Pages).
• Add a bundle-size budget.

Acceptance: every push builds, tests and deploys a preview.

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• expires on Oct 5, 2026, 5:45 AM UTC-08:00