phase 5

ui/wasm/main.go

@@ -22,6 +22,9 @@
 // All functions return either a Uint8Array, a boolean, or fail closed.
 // They never throw — callers may inspect the boolean result or rely on
 // the canon-byte length to detect malformed input.
+
+//go:build js && wasm
+
 package main
 
 import (