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Headers, footers, docs shell, and other shared layout surfaces.
The public site uses shared layout pieces for the header, footer, and route framing. Edit those pieces when the change needs to apply across the site, not when you are only tuning one page.
The docs route has its own shell because it needs search, navigation, a narrow reading column, and
an optional right rail. Keep docs-specific concerns in src/docs/_components/*, and keep generic
layout concerns in src/components/layout/*.