feat: add missing RPC queries + 6 event parsers for full JS parity

RpcClient.cs:
- QuerySessionsForAccountAsync — sessions via RPC
- QuerySubscriptionsForAccountAsync — subscriptions via RPC
- QueryPlanAsync — single plan by ID via RPC

EventParser.cs — 6 new typed event parsers:
- ParseSessionRefund (sentinel.node.v3.EventRefund)
- ParseNodeStatus (sentinel.node.v3.EventUpdateStatus)
- ParseSessionDetails (sentinel.session.v3.EventUpdateDetails)
- ParseSubscriptionPay (sentinel.subscription.v3.EventPay)
- ParseSubscriptionEnd (sentinel.subscription.v3.EventEnd)
- ParseLeaseEnd (sentinel.lease.v1.EventEnd)

Now 12/12 event types have typed parsers (was 6/12).
Now 8 RPC query methods (was 5). Full parity with JS SDK.
Build: 0 errors.

Author: Sentinel-Bluebuilder

src/Sentinel.SDK.Core/EventParser.cs

@@ -78,6 +78,26 @@ public record LeaseCreatedEvent(
         int MaxHours
     );
 
+    /// <summary>Parsed sentinel.node.v3.EventRefund.</summary>
+    public record SessionRefundEvent(long SessionId, string AccAddress, string Amount);
+
+    /// <summary>Parsed sentinel.node.v3.EventUpdateStatus.</summary>
+    public record NodeStatusEvent(string Address, int Status);
+
+    /// <summary>Parsed sentinel.session.v3.EventUpdateDetails (bandwidth report).</summary>
+    public record SessionDetailsEvent(long SessionId, string AccAddress, string NodeAddress,
+        string DownloadBytes, string UploadBytes, string Duration);
+
+    /// <summary>Parsed sentinel.subscription.v3.EventPay.</summary>
+    public record SubscriptionPayEvent(long SubscriptionId, long PlanId, string AccAddress,
+        string ProvAddress, string Payment, string StakingReward);
+
+    /// <summary>Parsed sentinel.subscription.v3.EventEnd.</summary>
+    public record SubscriptionEndEvent(long SubscriptionId, long PlanId, string AccAddress);
+
+    /// <summary>Parsed sentinel.lease.v1.EventEnd.</summary>
+    public record LeaseEndEvent(long LeaseId, string NodeAddress, string ProvAddress);
+
     // ─── Parsing Methods ───────────────────────────────────────────
 
     /// <summary>
@@ -198,6 +218,83 @@ int MaxHours
         );
     }
 
+    /// <summary>Parse a SessionRefundEvent from TX result events.</summary>
+    public static SessionRefundEvent? ParseSessionRefund(string? txEventsJson)
+    {
+        var attrs = FindEvent(txEventsJson, EventTypes.NodeRefund);
+        if (attrs is null) return null;
+        return new SessionRefundEvent(
+            SessionId: ParseLong(attrs.GetValueOrDefault("session_id")),
+            AccAddress: attrs.GetValueOrDefault("acc_address") ?? "",
+            Amount: attrs.GetValueOrDefault("amount") ?? attrs.GetValueOrDefault("value") ?? "0"
+        );
+    }
+
+    /// <summary>Parse a NodeStatusEvent from TX result events.</summary>
+    public static NodeStatusEvent? ParseNodeStatus(string? txEventsJson)
+    {
+        var attrs = FindEvent(txEventsJson, EventTypes.NodeUpdateStatus);
+        if (attrs is null) return null;
+        return new NodeStatusEvent(
+            Address: attrs.GetValueOrDefault("address") ?? "",
+            Status: int.TryParse(attrs.GetValueOrDefault("status"), out var s) ? s : 0
+        );
+    }
+
+    /// <summary>Parse a SessionDetailsEvent (bandwidth update) from TX result events.</summary>
+    public static SessionDetailsEvent? ParseSessionDetails(string? txEventsJson)
+    {
+        var attrs = FindEvent(txEventsJson, EventTypes.SessionUpdateDetails);
+        if (attrs is null) return null;
+        return new SessionDetailsEvent(
+            SessionId: ParseLong(attrs.GetValueOrDefault("session_id") ?? attrs.GetValueOrDefault("id")),
+            AccAddress: attrs.GetValueOrDefault("acc_address") ?? "",
+            NodeAddress: attrs.GetValueOrDefault("node_address") ?? "",
+            DownloadBytes: attrs.GetValueOrDefault("download_bytes") ?? "0",
+            UploadBytes: attrs.GetValueOrDefault("upload_bytes") ?? "0",
+            Duration: attrs.GetValueOrDefault("duration") ?? "0"
+        );
+    }
+
+    /// <summary>Parse a SubscriptionPayEvent from TX result events.</summary>
+    public static SubscriptionPayEvent? ParseSubscriptionPay(string? txEventsJson)
+    {
+        var attrs = FindEvent(txEventsJson, EventTypes.SubscriptionPay);
+        if (attrs is null) return null;
+        return new SubscriptionPayEvent(
+            SubscriptionId: ParseLong(attrs.GetValueOrDefault("subscription_id") ?? attrs.GetValueOrDefault("id")),
+            PlanId: ParseLong(attrs.GetValueOrDefault("plan_id")),
+            AccAddress: attrs.GetValueOrDefault("acc_address") ?? "",
+            ProvAddress: attrs.GetValueOrDefault("prov_address") ?? "",
+            Payment: attrs.GetValueOrDefault("payment") ?? "0",
+            StakingReward: attrs.GetValueOrDefault("staking_reward") ?? "0"
+        );
+    }
+
+    /// <summary>Parse a SubscriptionEndEvent from TX result events.</summary>
+    public static SubscriptionEndEvent? ParseSubscriptionEnd(string? txEventsJson)
+    {
+        var attrs = FindEvent(txEventsJson, EventTypes.SubscriptionEnd);
+        if (attrs is null) return null;
+        return new SubscriptionEndEvent(
+            SubscriptionId: ParseLong(attrs.GetValueOrDefault("subscription_id") ?? attrs.GetValueOrDefault("id")),
+            PlanId: ParseLong(attrs.GetValueOrDefault("plan_id")),
+            AccAddress: attrs.GetValueOrDefault("acc_address") ?? ""
+        );
+    }
+
+    /// <summary>Parse a LeaseEndEvent from TX result events.</summary>
+    public static LeaseEndEvent? ParseLeaseEnd(string? txEventsJson)
+    {
+        var attrs = FindEvent(txEventsJson, EventTypes.LeaseEnd);
+        if (attrs is null) return null;
+        return new LeaseEndEvent(
+            LeaseId: ParseLong(attrs.GetValueOrDefault("lease_id") ?? attrs.GetValueOrDefault("id")),
+            NodeAddress: attrs.GetValueOrDefault("node_address") ?? "",
+            ProvAddress: attrs.GetValueOrDefault("prov_address") ?? ""
+        );
+    }
+
     // ─── Helpers ───────────────────────────────────────────────────
 
     private static long? TryExtractSessionIdFromEvent(JsonElement ev)

src/Sentinel.SDK.Core/RpcClient.cs

@@ -189,6 +189,60 @@ public async Task<List<ChainNode>> QueryNodesForPlanAsync(ulong planId, int stat
             .ToList();
     }
 
+    /// <summary>Query sessions for an account via RPC.</summary>
+    /// <param name="address">Account address (sent1...).</param>
+    /// <param name="limit">Maximum sessions to return.</param>
+    /// <param name="ct">Cancellation token.</param>
+    /// <returns>Raw protobuf session bytes (Any-encoded).</returns>
+    public async Task<List<byte[]>> QuerySessionsForAccountAsync(string address, int limit = 100, CancellationToken ct = default)
+    {
+        using var ms = new MemoryStream();
+        ProtobufWriter.WriteStringField(ms, 1, address);
+        using var pag = new MemoryStream();
+        ProtobufWriter.WriteVarintField(pag, 2, (ulong)limit);
+        ProtobufWriter.WriteEmbeddedField(ms, 2, pag.ToArray());
+        var response = await AbciQueryAsync("/sentinel.session.v3.QueryService/QuerySessionsForAccount", ms.ToArray(), ct);
+        var fields = ProtobufReader.Decode(response);
+        return ProtobufReader.GetFields(fields, 1).Select(f => f.Data.ToArray()).ToList();
+    }
+
+    /// <summary>Query subscriptions for an account via RPC.</summary>
+    /// <param name="address">Account address (sent1...).</param>
+    /// <param name="limit">Maximum subscriptions to return.</param>
+    /// <param name="ct">Cancellation token.</param>
+    /// <returns>Raw protobuf subscription bytes.</returns>
+    public async Task<List<byte[]>> QuerySubscriptionsForAccountAsync(string address, int limit = 100, CancellationToken ct = default)
+    {
+        using var ms = new MemoryStream();
+        ProtobufWriter.WriteStringField(ms, 1, address);
+        using var pag = new MemoryStream();
+        ProtobufWriter.WriteVarintField(pag, 2, (ulong)limit);
+        ProtobufWriter.WriteEmbeddedField(ms, 2, pag.ToArray());
+        var response = await AbciQueryAsync("/sentinel.subscription.v3.QueryService/QuerySubscriptionsForAccount", ms.ToArray(), ct);
+        var fields = ProtobufReader.Decode(response);
+        return ProtobufReader.GetFields(fields, 1).Select(f => f.Data.ToArray()).ToList();
+    }
+
+    /// <summary>Query a single plan by ID via RPC.</summary>
+    /// <param name="planId">Plan ID.</param>
+    /// <param name="ct">Cancellation token.</param>
+    /// <returns>Raw protobuf plan bytes, or null if not found.</returns>
+    public async Task<byte[]?> QueryPlanAsync(ulong planId, CancellationToken ct = default)
+    {
+        try
+        {
+            using var ms = new MemoryStream();
+            ProtobufWriter.WriteVarintField(ms, 1, planId);
+            var response = await AbciQueryAsync("/sentinel.plan.v3.QueryService/QueryPlan", ms.ToArray(), ct);
+            var fields = ProtobufReader.Decode(response);
+            return ProtobufReader.GetField(fields, 1)?.Data.ToArray();
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
     /// <inheritdoc />
     public void Dispose() => _http.Dispose();
 }