refactor: add "sealed" keyword to core classes

- additionally removed some unused usings

Closes #106

Author: srebrek

src/MaIN.Core/Hub/AiHub.cs

@@ -13,7 +13,7 @@ public static class AIHub
     private static IHttpClientFactory _httpClientFactory = null!;
 
     internal static void Initialize(IAIHubServices services,
-        MaINSettings settings, 
+        MaINSettings settings,
         IHttpClientFactory httpClientFactory)
     {
         _services = services;
@@ -38,7 +38,7 @@ public static void DisableLLamaLogs()
         {
             NativeLogConfig.llama_log_set((_,_) => {});
         }
-        
+
         public static void DisableNotificationsLogs()
         {
             INotificationService.Disable = true;

src/MaIN.Core/Hub/Contexts/AgentContext.cs

@@ -12,7 +12,7 @@
 
 namespace MaIN.Core.Hub.Contexts;
 
-public class AgentContext
+public sealed class AgentContext
 {
     private readonly IAgentService _agentService;
     private InferenceParams? _inferenceParams;

src/MaIN.Core/Hub/Contexts/ChatContext.cs

@@ -10,7 +10,7 @@
 
 namespace MaIN.Core.Hub.Contexts;
 
-public class ChatContext
+public sealed class ChatContext
 {
     private readonly IChatService _chatService;
     private bool _preProcess;

src/MaIN.Core/Hub/Contexts/FlowContext.cs

@@ -4,14 +4,12 @@
 using MaIN.Domain.Entities;
 using MaIN.Domain.Entities.Agents;
 using MaIN.Domain.Entities.Agents.AgentSource;
-using MaIN.Services.Dtos;
-using MaIN.Services.Mappers;
 using MaIN.Services.Services.Abstract;
 using MaIN.Services.Services.Models;
 
 namespace MaIN.Core.Hub.Contexts;
 
-public class FlowContext
+public sealed class FlowContext
 {
     private readonly IAgentFlowService _flowService;
     private readonly IAgentService _agentService;

src/MaIN.Core/Hub/Contexts/McpContext.cs

@@ -1,14 +1,12 @@
-
 using MaIN.Domain.Configuration;
 using MaIN.Domain.Entities;
 using MaIN.Services.Constants;
-using MaIN.Services.Services;
 using MaIN.Services.Services.Abstract;
 using MaIN.Services.Services.Models;
 
 namespace MaIN.Core.Hub.Contexts;
 
-public class McpContext
+public sealed class McpContext
 {
     private readonly IMcpService _mcpService;
     private Mcp? _mcpConfig;

src/MaIN.Core/Hub/Contexts/ModelContext.cs

@@ -7,7 +7,7 @@
 
 namespace MaIN.Core.Hub.Contexts;
 
-public class ModelContext
+public sealed class ModelContext
 {
     private readonly MaINSettings _settings;
     private readonly IHttpClientFactory _httpClientFactory;

src/MaIN.Core/Hub/Utils/KnowledgeBuilder.cs

@@ -5,7 +5,7 @@
 
 namespace MaIN.Core.Hub.Utils;
 
-public class KnowledgeBuilder
+public sealed class KnowledgeBuilder
 {
     private Agent? _agent;
     private KnowledgeIndex? _index;

src/MaIN.Core/Hub/Utils/StepBuilder.cs

@@ -3,7 +3,7 @@
 
 namespace MaIN.Core.Hub.Utils;
 
-public class StepBuilder
+public sealed class StepBuilder
 {
     private readonly List<string> Steps = new();
     public static StepBuilder Instance => new();

src/MaIN.Core/Hub/Utils/ToolConfigurationBuilder.cs

@@ -3,7 +3,7 @@
 
 namespace MaIN.Core.Hub.Utils;
 //TODO try to share logic of adding tool to the list across methods https://github.com/wisedev-code/MaIN.NET/pull/98#discussion_r2454997846
-public class ToolsConfigurationBuilder
+public sealed class ToolsConfigurationBuilder
 {
     private readonly ToolsConfiguration _config = new() { Tools = [] };
 

src/MaIN.Core/Interfaces/IAIHubService.cs

@@ -1,4 +1,3 @@
-using MaIN.Services.Services;
 using MaIN.Services.Services.Abstract;
 
 namespace MaIN.Core.Interfaces;