Telegram plugin: inbound messages not delivered to session (v2.1.88)

Description

Telegram MCP plugin can SEND messages (reply tool works) but incoming messages never appear in the session as <channel> tags.

Evidence

• Bot polls successfully (getUpdates returns empty after message sent)
• Bun process has active TCP connections to Telegram servers
• MCP stdio pipes between bun and Claude Code are connected
• mcp.notification({ method: 'notifications/claude/channel' }) is called but never surfaces
• Only one Telegram bun process running (no 409 conflict)
• access.json correctly configured with sender in allowFrom
• Plugin shows as "connected" in /mcp

Environment

• Claude Code v2.1.88
• macOS Darwin 25.3.0
• telegram@claude-plugins-official (0.0.1 from GitHub main)
• bun 1.3.11

Steps to Reproduce

1. Install telegram plugin, configure bot token
2. Start claude session
3. Verify Telegram shows connected in /mcp
4. Send message TO the bot from Telegram
5. Message never appears in session

Sending FROM Claude (reply tool) works fine.