chore: sync from fn-registry agent

main.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"fn-registry/functions/infra"
+)
+
+const usage = `set_exe_icon - embed a .ico into a Windows .exe (post-build, no deps)
+
+Usage:
+  set_exe_icon <exe> <ico>
+
+Notes:
+  Modifies the .exe in place (creates a backup at <exe>.bak first).
+  Only supports PE binaries without an existing .rsrc section.
+`
+
+func main() {
+	if len(os.Args) != 3 {
+		fmt.Fprint(os.Stderr, usage)
+		os.Exit(2)
+	}
+	exePath, icoPath := os.Args[1], os.Args[2]
+
+	bak := exePath + ".bak"
+	src, err := os.ReadFile(exePath)
+	if err != nil {
+		die("read exe: %v", err)
+	}
+	if err := os.WriteFile(bak, src, 0o755); err != nil {
+		die("write backup: %v", err)
+	}
+
+	if err := infra.SetExeIcon(exePath, icoPath); err != nil {
+		_ = os.WriteFile(exePath, src, 0o755)
+		_ = os.Remove(bak)
+		die("set icon: %v", err)
+	}
+	fmt.Printf("OK: icon embedded in %s (backup: %s)\n", exePath, bak)
+}
+
+func die(format string, a ...any) {
+	fmt.Fprintf(os.Stderr, "error: "+format+"\n", a...)
+	os.Exit(1)
+}