Phase 5: Wi-Fi manager w/ reconnect, Scryfall HTTPS client + cJSON caching to /spiffs on net_task (Core 0)

main/wifi_manager.h

@@ -0,0 +1,40 @@
+/*
+ * MTG RFID Companion - Wi-Fi manager (Core 0)
+ *
+ * Phase 5 Step 5.1: Station-mode auto-connect with disconnect event
+ * handling and reconnect back-off.
+ */
+
+#pragma once
+
+#include "esp_err.h"
+#include "freertos/FreeRTOS.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Initialize the Wi-Fi subsystem (netif, driver, events).
+ * @return ESP_OK on success.
+ */
+esp_err_t wifi_manager_init(void);
+
+/**
+ * @brief Start station mode and attempt to connect to the configured AP.
+ */
+esp_err_t wifi_manager_start(void);
+
+/**
+ * @brief True if the STA has a valid IP.
+ */
+bool wifi_manager_connected(void);
+
+/**
+ * @brief Block until connected or timeout. Returns ESP_OK if connected.
+ */
+esp_err_t wifi_manager_wait_connected(TickType_t timeout_ticks);
+
+#ifdef __cplusplus
+}
+#endif