Remove workspace state subsystem

internal/fileutil/fileutil.go

@@ -1,4 +1,4 @@
-// Package fileutil provides narrow filesystem helpers for durable artifacts.
+// Package fileutil provides narrow filesystem helpers for operator-owned outputs.
 package fileutil
 
 import (
@@ -38,11 +38,3 @@ func WriteJSONAtomic(path string, value any) error {
 	}
 	return WriteFileAtomic(path, data)
 }
-
-func CopyFileAtomic(source string, target string) error {
-	data, err := os.ReadFile(source)
-	if err != nil {
-		return fmt.Errorf("read %q: %w", source, err)
-	}
-	return WriteFileAtomic(target, data)
-}