feat: add skills system with weather, daily-briefing, and skill-creator

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

main/mimi.c

@@ -26,8 +26,7 @@
 #include "ui/config_screen.h"
 #include "imu/imu_manager.h"
 #include "rgb/rgb.h"
-#include "cron/cron_service.h"
-#include "heartbeat/heartbeat.h"
+#include "skills/skill_loader.h"
 
 static const char *TAG = "mimi";
 
@@ -122,6 +121,7 @@ void app_main(void)
     /* Initialize subsystems */
     ESP_ERROR_CHECK(message_bus_init());
     ESP_ERROR_CHECK(memory_store_init());
+    ESP_ERROR_CHECK(skill_loader_init());
     ESP_ERROR_CHECK(session_mgr_init());
     ESP_ERROR_CHECK(wifi_manager_init());
     ESP_ERROR_CHECK(http_proxy_init());