fix(ci): add ESP_ERR_NOT_FOUND to fuzz stubs

mmwave_sensor stub returns ESP_ERR_NOT_FOUND which wasn't
defined in the minimal esp_stubs.h for host-based fuzz testing.

Co-Authored-By: claude-flow <ruv@ruv.net>

Author: ruvnet

firmware/esp32-csi-node/test/stubs/esp_stubs.h

@@ -20,8 +20,9 @@
 typedef int esp_err_t;
 #define ESP_OK          0
 #define ESP_FAIL        (-1)
-#define ESP_ERR_NO_MEM  0x101
+#define ESP_ERR_NO_MEM      0x101
 #define ESP_ERR_INVALID_ARG 0x102
+#define ESP_ERR_NOT_FOUND   0x105
 
 /* ---- esp_log.h ---- */
 #define ESP_LOGI(tag, fmt, ...)  ((void)0)