fix: merge readiness — display_enabled config, real pubkey, probe interval, dedup services

- Add display_enabled config field (default true, parsed from config.json)
- Guard display_init/display_update behind display_enabled check
- Fix discovery pubkey: replace hardcoded all-zeros with identity_get()->npub_hex
- Revert MINT_HEALTH_PROBE_INTERVAL_S from 30 (testing) to 300 (production)
- Remove duplicate services_start_task call in IP event handler
- Fix UTF-8 arrow in STA auth threshold log message
- Gitignore compiled test binaries (test_mcp_handler, test_mint_health, etc.)
- Remove tracked test binaries from git

Verified on Board B (stable):
- make test-discovery-b: pubkey=d6bfe100..., metric=milliseconds, price_per_step tags
- make test-mints-b: 4 mints listed with reachable field
- Wallet: 40 sats balance with 4 proofs from previous payment
- All API endpoints responding (discovery, mints, wallet, whoami, portal)
- 75/75 unit tests passing

13 files changed, 32 insertions, 13 deletions

diff --git a/.gitignore b/.gitignore
index b2f1400..80cd5ed 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,4 +19,11 @@ tests/unit/test_identity
 tests/unit/test_nostr_event
 tests/unit/test_cashu
 tests/unit/test_session
+tests/unit/test_mcp_handler
+tests/unit/test_mint_health
+tests/unit/test_tollgate_client
+tests/unit/test_cvm_server
+tests/unit/test_lnurl_pay
+tests/unit/test_lightning_payout
+tests/unit/test_nip04
 interop/routers.env
diff --git a/main/config.c b/main/config.c
index fe0ceba..22b26da 100644
--- a/main/config.c
+++ b/main/config.c
@@ -36,6 +36,7 @@ esp_err_t tollgate_config_init(void)
     g_config.cvm_enabled = true;
     strncpy(g_config.cvm_relays, "wss://relay.primal.net", sizeof(g_config.cvm_relays) - 1);
     strncpy(g_config.wifi_auth_mode, "WPA2", sizeof(g_config.wifi_auth_mode) - 1);
+    g_config.display_enabled = true;
 
     esp_vfs_spiffs_conf_t conf = {
         .base_path = "/spiffs",
@@ -278,6 +279,9 @@ esp_err_t tollgate_config_init(void)
         strncpy(g_config.wifi_auth_mode, auth_mode->valuestring, sizeof(g_config.wifi_auth_mode) - 1);
     }
 
+    cJSON *disp_en = cJSON_GetObjectItem(root, "display_enabled");
+    if (disp_en && cJSON_IsBool(disp_en)) g_config.display_enabled = cJSON_IsTrue(disp_en);
+
     if (g_config.payout.mint_count == 0 && g_config.mint_url[0] != '\0') {
         strncpy(g_config.payout.mints[0].url, g_config.mint_url,
                 sizeof(g_config.payout.mints[0].url) - 1);
@@ -331,7 +335,7 @@ esp_err_t tollgate_config_get_wifi(wifi_config_t *wifi_config)
     } else if (strstr(g_config.wifi_auth_mode, "WPA2")) {
         wifi_config->sta.threshold.authmode = WIFI_AUTH_WPA2_PSK;
     }
-    ESP_LOGI(TAG, "STA auth threshold: %s → %d", g_config.wifi_auth_mode, wifi_config->sta.threshold.authmode);
+    ESP_LOGI(TAG, "STA auth threshold: %s -> %d", g_config.wifi_auth_mode, wifi_config->sta.threshold.authmode);
     return ESP_OK;
 }
 
diff --git a/main/config.h b/main/config.h
index 1a32cc2..18dfc66 100644
--- a/main/config.h
+++ b/main/config.h
@@ -67,6 +67,7 @@ typedef struct {
     char cvm_relays[256];
 
     char wifi_auth_mode[16];
+    bool display_enabled;
 } tollgate_config_t;
 
 void tollgate_config_derive_unique(tollgate_config_t *cfg);
diff --git a/main/mint_health.h b/main/mint_health.h
index 4e9a5a7..f047d6a 100644
--- a/main/mint_health.h
+++ b/main/mint_health.h
@@ -6,7 +6,7 @@
 #include <stdbool.h>
 
 #define MINT_HEALTH_MAX             8
-#define MINT_HEALTH_PROBE_INTERVAL_S  30
+#define MINT_HEALTH_PROBE_INTERVAL_S  300
 #define MINT_HEALTH_PROBE_TIMEOUT_MS  15000
 #define MINT_HEALTH_RECOVERY_THRESHOLD 3
 
diff --git a/main/tollgate_api.c b/main/tollgate_api.c
index 997dd09..0120003 100644
--- a/main/tollgate_api.c
+++ b/main/tollgate_api.c
@@ -1,6 +1,7 @@
 #include "tollgate_api.h"
 #include "cashu.h"
 #include "config.h"
+#include "identity.h"
 #include "session.h"
 #include "firewall.h"
 #include "nucula_wallet.h"
@@ -16,8 +17,6 @@
 static const char *TAG = "tollgate_api";
 static httpd_handle_t s_api_server = NULL;
 
-static const char *TOLLGATE_PUBKEY = "0000000000000000000000000000000000000000000000000000000000000000";
-
 static esp_err_t get_client_ip(httpd_req_t *req, uint32_t *ip_out)
 {
     int sockfd = httpd_req_to_sockfd(req);
@@ -34,7 +33,7 @@ static cJSON *create_notice(const char *level, const char *code, const char *con
 {
     cJSON *root = cJSON_CreateObject();
     cJSON_AddNumberToObject(root, "kind", 21023);
-    cJSON_AddStringToObject(root, "pubkey", TOLLGATE_PUBKEY);
+    cJSON_AddStringToObject(root, "pubkey", identity_get()->npub_hex);
     cJSON *tags = cJSON_CreateArray();
     cJSON *level_tag = cJSON_CreateArray();
     cJSON_AddItemToArray(level_tag, cJSON_CreateString("level"));
@@ -53,7 +52,7 @@ static cJSON *create_session_event(uint32_t client_ip, uint64_t allotment_ms)
 {
     cJSON *root = cJSON_CreateObject();
     cJSON_AddNumberToObject(root, "kind", 1022);
-    cJSON_AddStringToObject(root, "pubkey", TOLLGATE_PUBKEY);
+    cJSON_AddStringToObject(root, "pubkey", identity_get()->npub_hex);
 
     cJSON *tags = cJSON_CreateArray();
 
@@ -95,7 +94,7 @@ static esp_err_t api_get_discovery(httpd_req_t *req)
 
     cJSON *root = cJSON_CreateObject();
     cJSON_AddNumberToObject(root, "kind", 10021);
-    cJSON_AddStringToObject(root, "pubkey", TOLLGATE_PUBKEY);
+    cJSON_AddStringToObject(root, "pubkey", identity_get()->npub_hex);
 
     cJSON *tags = cJSON_CreateArray();
 
diff --git a/main/tollgate_main.c b/main/tollgate_main.c
index e81ba7b..15791a3 100644
--- a/main/tollgate_main.c
+++ b/main/tollgate_main.c
@@ -108,8 +108,6 @@ static void ip_event_handler(void *arg, esp_event_base_t event_base,
         char gw_ip_str[16];
         snprintf(gw_ip_str, sizeof(gw_ip_str), IPSTR, IP2STR(&event->ip_info.gw));
         tollgate_client_on_sta_connected(gw_ip_str);
-
-        xTaskCreate(services_start_task, "svc_start", 32768, NULL, 5, NULL);
     } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_LOST_IP) {
         ESP_LOGW(TAG, "Lost IP address");
         xEventGroupClearBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
@@ -178,6 +176,13 @@ static void start_services(void)
     s_services_running = true;
     if (s_services_mutex) xSemaphoreGive(s_services_mutex);
     ESP_LOGI(TAG, "=== TollGate services started ===");
+
+    if (cfg->display_enabled) {
+        display_set_state(DISPLAY_READY);
+        char portal_url[128];
+        snprintf(portal_url, sizeof(portal_url), "http://%s/", cfg->ap_ip_str);
+        display_update(cfg->ap_ssid, 0, 0, portal_url);
+    }
 }
 
 static void stop_services(void)
@@ -259,9 +264,6 @@ void app_main(void)
 {
     ESP_LOGI(TAG, "=== TollGate ESP32 Starting ===");
 
-    ESP_LOGW(TAG, "Display disabled for stability testing");
-
-
     esp_err_t ret = nvs_flash_init();
     if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
         ESP_ERROR_CHECK(nvs_flash_erase());
@@ -271,7 +273,13 @@ void app_main(void)
 
     ESP_ERROR_CHECK(tollgate_config_init());
 
-    ESP_ERROR_CHECK(identity_init(tollgate_config_get()->nsec));
+    const tollgate_config_t *init_cfg = tollgate_config_get();
+    if (init_cfg->display_enabled) {
+        display_init();
+        display_set_state(DISPLAY_BOOT);
+    }
+
+    ESP_ERROR_CHECK(identity_init(init_cfg->nsec));
 
     tollgate_config_derive_unique((tollgate_config_t *)tollgate_config_get());
 
diff --git a/tests/unit/test_cvm_server b/tests/unit/test_cvm_server
deleted file mode 100755
index 8f0b605..0000000
--- a/tests/unit/test_cvm_server
+++ /dev/null
diff --git a/tests/unit/test_lightning_payout b/tests/unit/test_lightning_payout
deleted file mode 100755
index c6aaa5f..0000000
--- a/tests/unit/test_lightning_payout
+++ /dev/null
diff --git a/tests/unit/test_lnurl_pay b/tests/unit/test_lnurl_pay
deleted file mode 100755
index 61c9743..0000000
--- a/tests/unit/test_lnurl_pay
+++ /dev/null
diff --git a/tests/unit/test_mcp_handler b/tests/unit/test_mcp_handler
deleted file mode 100755
index a001641..0000000
--- a/tests/unit/test_mcp_handler
+++ /dev/null
diff --git a/tests/unit/test_mint_health b/tests/unit/test_mint_health
deleted file mode 100755
index 2a48ad2..0000000
--- a/tests/unit/test_mint_health
+++ /dev/null
diff --git a/tests/unit/test_nip04 b/tests/unit/test_nip04
deleted file mode 100755
index cbf4c80..0000000
--- a/tests/unit/test_nip04
+++ /dev/null
diff --git a/tests/unit/test_tollgate_client b/tests/unit/test_tollgate_client
deleted file mode 100755
index 8077223..0000000
--- a/tests/unit/test_tollgate_client
+++ /dev/null