Channels plugin: inbound notifications not surfaced to session

Bug

Telegram channel plugin receives inbound messages, passes gate/access control, and the MCP notifications/claude/channel notification resolves successfully (notification sent OK in debug.log) — but the message is never surfaced to the model in the active session.

Outbound works fine — calling the reply tool from the session successfully sends messages to Telegram.

Environment

• Claude Code v2.1.94 and v2.1.97 (tested both)
• Windows 11 Pro
• Telegram plugin v0.0.4 (official, from claude-plugins-official)
• Plugin loads correctly, tools are available (reply, react, edit_message, download_attachment)

Steps to reproduce

1. Enable Telegram plugin, start claude session
2. Verify plugin is connected (telegram tools appear in tool list)
3. Send a message from Telegram to the bot
4. Bot receives message, gate=deliver, notification sent OK (confirmed via debug.log at ~/.claude/channels/telegram/debug.log)
5. Expected: Message appears in session as <channel source="telegram" ...> tag
6. Actual: Nothing happens. Session never sees the message.

Debug log showing successful delivery

[2026-04-09T02:48:39.574Z] from=XXXXXXX chat=XXXXXXX text=Test123
  gate=deliver
  sending notification for: Test123
  notification sent OK

Additional context

• This worked earlier in the day on the same version (v2.1.94), then stopped
• Fresh sessions exhibit the same behavior — not a stale session issue
• No zombie bun processes — both bun PIDs started at the same time as the session
• The mcp.notification() promise resolves, meaning the JSON-RPC notification was written to stdout successfully
• Claude Code just isn't reading/processing those notifications from the MCP stdio transport