Phase 0: scaffold e_iwd Enlightenment module

Meson build, module entry points, and stub layout for the iwd backend
(D-Bus client, gadget, popup, config, UI widgets). Bodies are TODOs;
this compiles against EFL/E headers but performs no D-Bus work yet.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/e_mod_gadget.c

@@ -0,0 +1,23 @@
+#include "e_mod_main.h"
+#include "e_mod_gadget.h"
+#include "e_mod_popup.h"
+
+/* TODO: register with E gadget system, draw status icon, handle clicks */
+
+void
+e_iwd_gadget_init(void)
+{
+   /* TODO: e_gadget_type_add("iwd", _create_cb, NULL); */
+}
+
+void
+e_iwd_gadget_shutdown(void)
+{
+   /* TODO: e_gadget_type_del("iwd"); */
+}
+
+void
+e_iwd_gadget_update(void)
+{
+   /* TODO: refresh icon/tooltip from current iwd_manager state */
+}