feat: add reproducible portal README media

test/portal-harness/src/main.cpp

@@ -20,8 +20,13 @@ void setup() {
     Serial.begin(115200);
     delay(300);
 
-    // The fixture intentionally has no station credentials. A finite window
-    // exercises timeout reset without leaving a board in a permanent portal.
+    // This fixture must be independent of whichever sketch was previously
+    // flashed to the board. Clear saved station credentials before starting
+    // the portal so browser artifacts always show the unconfigured flow.
+    wifi.resetSettings();
+
+    // A finite window exercises timeout reset without leaving a board in a
+    // permanent portal.
     wifi.setConfigPortalTimeout(15 * 60);
     wifi.setAPStaticIPConfig(
         IPAddress(192, 168, 4, 1),

test/test_wifimanager/test_main.cpp

@@ -105,6 +105,7 @@ TestCase tests[] = {
     TEST_ENTRY(test_scan_cancels_when_connect_pending),
     TEST_ENTRY(test_scan_cancels_when_lifecycle_blocked),
     TEST_ENTRY(test_scan_generation_invalidated_on_reset),
+    TEST_ENTRY(test_scan_restart_interval_is_platform_appropriate),
 
     TEST_ENTRY(test_real_async_scan_completes),
     // Template rendering tests

test/test_wifimanager/test_main.h

@@ -107,6 +107,7 @@ void test_scan_completion_wait();
 void test_scan_cancels_when_connect_pending();
 void test_scan_cancels_when_lifecycle_blocked();
 void test_scan_generation_invalidated_on_reset();
+void test_scan_restart_interval_is_platform_appropriate();
 void test_real_async_scan_completes();
 
 // Template rendering tests

test/test_wifimanager/tests/test_wifi_scanning.cpp

@@ -150,3 +150,24 @@ void test_scan_generation_invalidated_on_reset() {
     Serial.println("[TEST]   Scan generation invalidation on reset test completed successfully");
 }
 
+void test_scan_restart_interval_is_platform_appropriate() {
+    Serial.println("[TEST]   Testing platform scan restart interval...");
+
+    WiFiManager wm;
+
+#ifdef UNIT_TEST
+  #ifdef ESP32
+    TEST_ASSERT_EQUAL_UINT32_MESSAGE(
+        5000, wm.wmTestGetScanRestartIntervalMs(),
+        "ESP32 must wait for the radio to settle after a completed scan");
+  #else
+    TEST_ASSERT_EQUAL_UINT32_MESSAGE(
+        2000, wm.wmTestGetScanRestartIntervalMs(),
+        "ESP8266 keeps the established responsive scan restart interval");
+  #endif
+#else
+    TEST_IGNORE_MESSAGE("UNIT_TEST helpers unavailable");
+#endif
+
+    Serial.println("[TEST]   Platform scan restart interval test completed successfully");
+}