commit c8669ebc7266869720cd82347a279d5df95b518f
Author: fn-registry agent <agent@fn-registry>
Date:   Thu Apr 30 16:02:59 2026 +0200

    chore: sync from fn-registry agent

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..dcfaf86
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+set_exe_icon
+*.exe
+*.bak
diff --git a/app.md b/app.md
new file mode 100644
index 0000000..c3503ed
--- /dev/null
+++ b/app.md
@@ -0,0 +1,37 @@
+---
+name: set_exe_icon
+lang: go
+domain: infra
+description: "CLI Windows que embebe un .ico en un .exe (post-build) sin dependencias externas. Wrapper sobre la funcion set_exe_icon_go_infra del registry. Crea backup .bak antes de modificar."
+tags: [windows, pe, exe, icon, cli]
+uses_functions:
+  - set_exe_icon_go_infra
+uses_types: []
+framework: ""
+entry_point: "main.go"
+dir_path: "apps/set_exe_icon"
+---
+
+## Build
+
+```bash
+# Linux nativo
+go build -o set_exe_icon .
+
+# Cross-compile a Windows
+GOOS=windows GOARCH=amd64 CGO_ENABLED=0 go build -ldflags "-s -w" -o set_exe_icon.exe .
+```
+
+## Uso
+
+```cmd
+set_exe_icon.exe miapp.exe logo.ico
+```
+
+Crea `miapp.exe.bak` y sobrescribe `miapp.exe` con el icono embebido.
+
+## Limitaciones
+
+- No soporta .exe que ya tienen seccion `.rsrc` (devuelve error y restaura el backup).
+- El checksum PE se pone a 0 (Windows lo ignora salvo para drivers/ntoskrnl).
+- Authenticode signing queda invalidado tras la modificacion.
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..9e96818
--- /dev/null
+++ b/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)
+}