Sarmkadan

```csharp
// Author: Vladyslav Zaiets | https://sarmkadan.com
// CTO & Software Architect

using System.Collections.Concurrent;
using System.Text.Json;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

Sarmkadan

```csharp
// Author: Vladyslav Zaiets | https://sarmkadan.com
// CTO & Software Architect

#nullable enable

using System.ComponentModel;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Text;

Sarmkadan

# Author: Vladyslav Zaiets | https://sarmkadan.com
# CTO & Software Architect

"""
Async Telegram bot framework built on aiohttp.

Features:
  - Decorator-based command & callback routing
  - Onion-style middleware chain
  - Finite-state machine (FSM) for multi-step conversations

Sarmkadan

// Author: Vladyslav Zaiets | https://sarmkadan.com
// CTO & Software Architect
//
// Distributed locking with Redis and SQLite backends for .NET 10
// Features: auto-renewal, fencing tokens, deadlock/stale-lock detection
//
// NuGet dependencies:
//   StackExchange.Redis >= 2.8
//   Microsoft.Data.Sqlite >= 9.0

Sarmkadan

// Author: Vladyslav Zaiets | https://sarmkadan.com
// CTO & Software Architect

/**
 * Lightweight Claude API client — zero dependencies.
 * Works in Node.js 18+ and modern browsers (native fetch + ReadableStream).
 * Features: streaming SSE, tool use with agentic loop, multi-turn conversations.
 *
 * @module claude-client
 */

Sarmkadan

// Author: Vladyslav Zaiets | https://sarmkadan.com
// CTO & Software Architect

#nullable enable

using System.Data.Common;
using System.Diagnostics;
using System.Net;
using System.Runtime.InteropServices;
using System.Text.Json;

Sarmkadan

// Author: Vladyslav Zaiets | https://sarmkadan.com
// CTO & Software Architect

using System.Collections.Concurrent;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace EventSourcing;

// ────────────────────────────────────────────────────────────────────────────

Sarmkadan

```csharp
// Author: Vladyslav Zaiets | https://sarmkadan.com
// CTO & Software Architect

using System.Net.Http.Headers;
using System.Runtime.CompilerServices;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;

Sarmkadan

```csharp
// Author: Vladyslav Zaiets | https://sarmkadan.com
// CTO & Software Architect

using System.Collections.Frozen;
using System.Security.Cryptography;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;

Sarmkadan

```csharp
// Author: Vladyslav Zaiets | https://sarmkadan.com
// CTO & Software Architect

using System.Collections.Concurrent;
using System.Security.Claims;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.SignalR;
using Microsoft.Extensions.DependencyInjection;