Make controller input best-effort and harden OTA rollback.

Accel/tap use fire-and-forget ESP-NOW with a 10 ms FreeRTOS-safe cadence, OTA recovers from seq gaps and auto-reboots after success, and bootloader app rollback confirms after a stable boot.

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

goTool/dashboard.go

@@ -75,7 +75,7 @@ type DashboardState struct {
 	UARTConnected bool   `json:"uart_connected"`
 	SerialOK      bool   `json:"serial_ok"`
 	SerialError   string `json:"serial_error,omitempty"`
-	/** Host: fast CACHE_STATUS poll (~16 ms) for accel + tap. */
+	/** Host: fast CACHE_STATUS poll (~8 ms) for accel + tap. */
 	LiveStream bool         `json:"live_stream"`
 	/** BLE live path: inter-tick stats from BleStreamTick.esp_timestamp_us. */
 	BleTick  *BleTickView `json:"ble_tick,omitempty"`
@@ -489,7 +489,7 @@ func (h *wsHub) snapshotClients() []ClientView {
 	return out
 }
 
-// patchLiveStream toggles host CACHE_STATUS polling (~16 ms).
+// patchLiveStream toggles host CACHE_STATUS polling (~8 ms).
 func (h *wsHub) patchLiveStream(enabled bool) {
 	h.mu.Lock()
 	h.liveStream = enabled