Telegram channel notifications not delivered to session

Description

Channel notifications via notifications/claude/channel from the Telegram MCP server are not being received by the Claude Code session.

Steps to reproduce

1. Configure Telegram plugin with a valid bot token
2. Set access policy to allowlist with a valid Telegram user ID
3. Send a DM to the bot from Telegram
4. Bot receives the message (typing indicator shows in Telegram)
5. The handleInbound function fires and calls mcp.notification({ method: 'notifications/claude/channel', ... })
6. Notification never appears in the Claude Code conversation

Expected behavior

The message should appear in the Claude Code session as a <channel source="telegram" ...> block, allowing the assistant to read and reply.

Actual behavior

• Bot receives the message (confirmed by typing indicator)
• reply tool works fine (can send messages TO Telegram)
• But inbound notifications are silently lost — they never reach the conversation

Environment

• Claude Code version: 2.1.81
• OS: macOS (Darwin 25.2.0)
• MCP server runtime: Bun
• Server declares: experimental: { 'claude/channel': {} } capability

Notes

• Restarting the session and /reload-plugins did not fix the issue
• The MCP server process is running and healthy
• Token is valid (getMe returns successfully)
• getUpdates returns empty (confirming the bot is consuming updates via polling)