feat(zhtlc): estimate activation percentage based on block height

packages/komodo_coin_updates/lib/src/coins_config/config_transform.dart

@@ -266,7 +266,7 @@ class ZhtlcLightWalletTransform implements CoinConfigTransform {
       'light_wallet_d_servers_wss',
     );
 
-    return lightWalletServersWss != null;
+    return lightWalletServersWss != null && lightWalletServersWss.isNotEmpty;
   }
 
   @override

packages/komodo_defi_sdk/lib/src/activation/protocol_strategies/zhtlc_activation_progress.dart

@@ -0,0 +1,90 @@
+// TODO(komodo-team): Allow passing the start sync mode; currently hard-coded
+// to sync from the time of activation.
+
+import 'package:komodo_defi_types/komodo_defi_types.dart';
+
+/// Convenience wrapper around [ActivationProgress] that exposes the canonical
+/// progress snapshots used throughout ZHTLC activation.
+class ZhtlcActivationProgress extends ActivationProgress {
+  static const errorCode = 'ZHTLC_ACTIVATION_ERROR';
+
+  const ZhtlcActivationProgress._({
+    required super.status,
+    super.isComplete,
+    super.errorMessage,
+    super.progressDetails,
+  });
+
+  /// Creates the initial "starting activation" progress update.
+  factory ZhtlcActivationProgress.starting(Asset asset) {
+    return ZhtlcActivationProgress._(
+      status: 'Starting ZHTLC activation...',
+      progressDetails: ActivationProgressDetails(
+        currentStep: ActivationStep.initialization,
+        stepCount: 6,
+        additionalInfo: {'protocol': 'ZHTLC', 'asset': asset.id.name},
+      ),
+    );
+  }
+
+  /// Emits progress while validating protocol configuration before task start.
+  factory ZhtlcActivationProgress.validation(ZhtlcProtocol protocol) {
+    return ZhtlcActivationProgress._(
+      status: 'Validating ZHTLC parameters...',
+      progressDetails: ActivationProgressDetails(
+        currentStep: ActivationStep.validation,
+        stepCount: 6,
+        additionalInfo: {
+          'electrumServers': protocol.requiredServers.toJsonRequest(),
+          'zcashParamsPath': protocol.zcashParamsPath,
+        },
+      ),
+    );
+  }
+
+  /// Emits a terminal failure progress snapshot for unexpected exceptions.
+  factory ZhtlcActivationProgress.failure(Object error, StackTrace stack) {
+    return ZhtlcActivationProgress._(
+      status: 'Activation failed',
+      errorMessage: error.toString(),
+      isComplete: true,
+      progressDetails: ActivationProgressDetails(
+        currentStep: ActivationStep.error,
+        stepCount: 6,
+        errorCode: ZhtlcActivationProgress.errorCode,
+        errorDetails: error.toString(),
+        stackTrace: stack.toString(),
+        additionalInfo: {
+          'errorType': error.runtimeType.toString(),
+          'timestamp': DateTime.now().toUtc().toIso8601String(),
+        },
+      ),
+    );
+  }
+
+  /// Emits a terminal failure snapshot when required Zcash params are missing.
+  factory ZhtlcActivationProgress.missingZcashParams() {
+    return const ZhtlcActivationProgress._(
+      status: 'Zcash params path required',
+      errorMessage: 'Zcash params path required',
+      isComplete: true,
+      progressDetails: ActivationProgressDetails(
+        currentStep: ActivationStep.error,
+        stepCount: 1,
+      ),
+    );
+  }
+}
+
+/// Additional helpers for creating ZHTLC-specific [ActivationProgress] states.
+extension ActivationProgressZhtlc on ActivationProgress {
+  /// Convenience helper for the missing Zcash params terminal state.
+  static ActivationProgress missingZcashParams() {
+    return ZhtlcActivationProgress.missingZcashParams();
+  }
+
+  /// Convenience helper for wrapping unexpected activation failures.
+  static ActivationProgress failure(Object error, StackTrace stack) {
+    return ZhtlcActivationProgress.failure(error, stack);
+  }
+}