Add channel notification support for push-based webhook alerts

[liplus-lin-lay]

Summary

Add notifications/claude/channel support to the MCP server so that new webhook events are pushed into the Claude session in real-time, instead of requiring polling.

Motivation

Currently, the MCP server is poll-based — Claude must call get_pending_status or list_pending_events to check for new events. With Claude Code v2.1.80's channel notification support, the server can proactively push notifications when new events arrive.

Approach

1. Register experimental: { 'claude/channel': {} } capability on the MCP server.
2. Watch events.json for changes using fs.watch.
3. When new pending events are detected, send notifications/claude/channel with event summary.
4. Track previously seen event IDs to avoid duplicate notifications.

Scope

• Experimental / test branch only initially.
• No changes to existing tool behavior.

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