chore: rebrand NuGet package IDs to Blue-Csharp-Sdk.*

Published to nuget.org as:
  - Blue-Csharp-Sdk.Core    2.1.0
  - Blue-Csharp-Sdk.Node    2.1.0
  - Blue-Csharp-Sdk.Tunnel  2.1.0

Previous IDs (Sentinel.SDK.*, Blue.Sentinel.SDK.*) are reserved
prefixes on NuGet and blocked publication with HTTP 409. Hyphen form
is valid and avoids the reservation.

Install: dotnet add package Blue-Csharp-Sdk.Node

Author: Sentinel-Bluebuilder

src/Sentinel.SDK.Core/Sentinel.SDK.Core.csproj

@@ -4,13 +4,14 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <RootNamespace>Sentinel.SDK.Core</RootNamespace>
-    <PackageId>Blue.Sentinel.SDK.Core</PackageId>
-    <Version>2.0.0</Version>
+    <PackageId>Blue-Csharp-Sdk.Core</PackageId>
+    <Version>2.1.0</Version>
     <Authors>Blue SDK Team</Authors>
     <Description>Blue Sentinel dVPN SDK for .NET — RPC queries, typed events, wallet, chain, transaction building. Tested on Windows.</Description>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageProjectUrl>https://github.com/Sentinel-Autonomybuilder/blue-csharp-sdk</PackageProjectUrl>
     <PackageTags>sentinel;dvpn;vpn;blockchain;cosmos;rpc;blue;p2p</PackageTags>
+    <PackageReleaseNotes>BREAKING: DisconnectAsync(bool endSession) replaced by DisconnectAsync() (soft) and DisconnectAndEndSessionAsync() (hard). See docs/features/DISCONNECT.md.</PackageReleaseNotes>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="NBitcoin" Version="7.*" />

src/Sentinel.SDK.Node/Sentinel.SDK.Node.csproj

@@ -4,13 +4,14 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <RootNamespace>Sentinel.SDK.Node</RootNamespace>
-    <PackageId>Sentinel.SDK.Node</PackageId>
-    <Version>1.0.0</Version>
+    <PackageId>Blue-Csharp-Sdk.Node</PackageId>
+    <Version>2.1.0</Version>
     <Authors>Sentinel dVPN Community</Authors>
     <Description>Sentinel dVPN SDK for .NET — V3 handshake, node status, session management</Description>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageProjectUrl>https://github.com/sentinel-official</PackageProjectUrl>
     <PackageTags>sentinel;dvpn;vpn;blockchain;cosmos</PackageTags>
+    <PackageReleaseNotes>BREAKING: DisconnectAsync(bool endSession) replaced by DisconnectAsync() (soft) and DisconnectAndEndSessionAsync() (hard). See docs/features/DISCONNECT.md.</PackageReleaseNotes>
   </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="..\Sentinel.SDK.Core\Sentinel.SDK.Core.csproj" />

src/Sentinel.SDK.Tunnel/Sentinel.SDK.Tunnel.csproj

@@ -4,13 +4,14 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <RootNamespace>Sentinel.SDK.Tunnel</RootNamespace>
-    <PackageId>Sentinel.SDK.Tunnel</PackageId>
-    <Version>1.0.0</Version>
+    <PackageId>Blue-Csharp-Sdk.Tunnel</PackageId>
+    <Version>2.1.0</Version>
     <Authors>Sentinel dVPN Community</Authors>
     <Description>Sentinel dVPN SDK for .NET — WireGuard and V2Ray tunnel management (Windows)</Description>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageProjectUrl>https://github.com/sentinel-official</PackageProjectUrl>
     <PackageTags>sentinel;dvpn;vpn;wireguard;v2ray;tunnel</PackageTags>
+    <PackageReleaseNotes>BREAKING: DisconnectAsync(bool endSession) replaced by DisconnectAsync() (soft) and DisconnectAndEndSessionAsync() (hard). See docs/features/DISCONNECT.md.</PackageReleaseNotes>
   </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="..\Sentinel.SDK.Core\Sentinel.SDK.Core.csproj" />