[Windows] Telegram channel inbound notifications not received by Claude Code

Description

On Windows 11, the Telegram MCP plugin's inbound notifications/claude/channel is not being received by Claude Code, while outbound (reply/react/edit tools) works perfectly.

Environment

• OS: Windows 11 Home 10.0.26200
• Claude Code: latest
• Shell: bash (Git Bash)
• Telegram plugin: 0.0.1

Steps to Reproduce

1. Configure Telegram bot token in ~/.claude/channels/telegram/.env
2. Add sender ID to allowFrom in access.json
3. Start Claude Code session
4. Send a DM to the bot from Telegram

Expected Behavior

• Bot sends ❤️ ack reaction
• Message appears in Claude Code session via notifications/claude/channel

Actual Behavior

• Bot responds to /start command correctly
• Bot can send outbound messages via reply tool (MCP connection works)
• Regular text messages ("Hi", "Test") get no ack reaction and no notification delivered to Claude Code
• getUpdates returns 409 Conflict (confirming MCP server IS polling)
• This issue is reproducible across sessions (observed 2026-03-22 and 2026-03-23)

Analysis

• The MCP server's polling loop is running (409 Conflict on manual getUpdates)
• Outbound tools work (reply sends successfully), proving MCP ↔ Claude Code stdio is functional
• The bot.on('message:text') handler appears to not fire for non-command messages, OR mcp.notification() silently fails
• The /start command handler works, but general message:text handler does not trigger ack reaction or notification