Seed from go-template-repo, renamed to simplexcalc

The template's files at a77fd30, without its history or LICENSE, after
script/rename simplexcalc.

Model: opus-5-5

static/static.go

@@ -0,0 +1,12 @@
+// Package static carries the static assets into the binary, so that a
+// deployment is one file and an asset can never be a version behind the
+// code that references it.
+package static
+
+import "embed"
+
+// FS holds the served assets. internal/server mounts it read-only at
+// /static/ and refuses directory listings.
+//
+//go:embed css/*.css js/*.js
+var FS embed.FS