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Every site's announcement bar now follows one template: Line 1 — identity + primary CTA (what is THIS site) Line 2 — the book (or, on book sites, the other volume) Line 3 — "Alongside the book:" sibling row (3 most-relevant verbs) Line 4 — newsletter The book is the anchor of the curriculum; every other site is a verb applied to it — TinyTorch (build), Hardware Kits (deploy), MLSys·im (simulate), Labs (explore), Slides + Instructors (teach). Making that shape visible in every bar turns nine independent sites into chapters of one curriculum. Removed stale copy: "Happy New Year!" on kits + labs, "coming in 2026" on labs (we are in 2026; replaced with "Coming Summer 2026"), TinyTorch v0.1.10 single-line release notice (belonged in a release changelog, not the always-visible nav bar). Normalized outbound links: /book -> /vol1/ and /vol2/, consistent trailing-slash hygiene on every URL. Newsletter link points to https://mlsysbook.ai/newsletter/ (the actual Quarto page) instead of #subscribe (which only resolves on the landing page). The landing site (mlsysbook.ai) uses a 5-line variant that covers all four learner verbs + the teacher-tools row; every other site uses the 4-line form. StaffML is a Next.js app, not a Quarto site, so its banner is out of scope for this PR and will ship as a separate React component change.