Add BMA456 tap detection with ESP-NOW notify and host snapshot API.

Slaves forward configured tap kinds to the master; goTool exposes CLI, dashboard, REST, and WebSocket with separate notify vs receive and 2s display cache.

Co-authored-by: Cursor <cursoragent@cursor.com>

main/bosch456.c

@@ -36,6 +36,8 @@ static bool s_have_last_sample;
 
 static volatile bool s_int_pending;
 static SemaphoreHandle_t s_accel_mutex;
+static bma456_tap_handler_t s_tap_handler;
+static void *s_tap_handler_ctx;
 
 static esp_err_t check_bma4(const char *api_name, int8_t rslt);
 
@@ -123,6 +125,11 @@ void bma456_set_accel_deadzone(uint32_t deadzone_lsb) {
 
 uint32_t bma456_get_accel_deadzone(void) { return s_accel_deadzone; }
 
+void bma456_set_tap_handler(bma456_tap_handler_t handler, void *ctx) {
+  s_tap_handler = handler;
+  s_tap_handler_ctx = ctx;
+}
+
 esp_err_t bma456_read_accel(int16_t *x, int16_t *y, int16_t *z) {
   if (!s_bma456_ready || x == NULL || y == NULL || z == NULL) {
     return ESP_ERR_INVALID_STATE;
@@ -183,10 +190,19 @@ static void handle_tap_interrupt(void) {
 
   if (tap_out.single_tap) {
     ESP_LOGI(TAG, "tap: single");
+    if (s_tap_handler != NULL) {
+      s_tap_handler(BMA456_TAP_SINGLE, s_tap_handler_ctx);
+    }
   } else if (tap_out.double_tap) {
     ESP_LOGI(TAG, "tap: double");
+    if (s_tap_handler != NULL) {
+      s_tap_handler(BMA456_TAP_DOUBLE, s_tap_handler_ctx);
+    }
   } else if (tap_out.triple_tap) {
     ESP_LOGI(TAG, "tap: triple");
+    if (s_tap_handler != NULL) {
+      s_tap_handler(BMA456_TAP_TRIPLE, s_tap_handler_ctx);
+    }
   }
 }