Refactor internal/render so every served page is a text/template in templates/, executed by a thin exported func. text/template (not html) keeps gemtext unescaped. The whitespace-heavy / union-branching sub-renders (post summaries, embeds, document blocks, doc links) stay in Go and are exposed to the templates as funcs, so layout lives in the template files while the gnarly bits keep their exact output. A golden test (testdata/golden/*.gmi) snapshots every page and is verified to match the pre-refactor output byte-for-byte; it stays as a regression guard (regenerate with `go test ./internal/render -update-golden`).