Reserved for step 1+. Currently empty; populated in later build steps (CSS,
htmx.min.js). The presence of this file is required so the embed.FS in
internal/static/static.go has at least one entry.
Package static owns the embedded static-asset filesystem. Lives in its
own package so the //go:embed directive sits next to the files it embeds
(Go forbids ../ in embed paths).
FS returns the static asset filesystem. README.md is included for now
because Go's embed requires at least one matching file; once real assets
land in step 1+ it can be removed.