[BUG] Telegram plugin (bun server.ts) orphans on session exit, causing high CPU

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Summary

Each Claude Code session spawns a new bun server.ts Telegram MCP plugin process
but does not kill the previous one when the session ends. On a server with multiple
daily sessions, these accumulate and saturate CPU.

## Environment

• OS: Ubuntu 24.04 (ARM64, Oracle Cloud)
• Claude Code version: 2.1.168
• Telegram plugin version: 0.0.6

## Root Cause
The orphan watchdog in server.ts (around line 670) checks:

```ts
process.ppid !== bootPpid

But when Claude Code exits, the direct parent (bun run --cwd ... start) does not
die — it gets reparented to init (PID 1). From server.ts's perspective, its own
ppid never changes, so the watchdog never fires and the process survives indefinitely.

What Should Happen?

At startup, record the grandparent PID (Claude Code itself) by reading
/proc/<ppid>/status. In the watchdog interval, check if bun run's parent has
changed (reparented to init = grandparent died):

function readParentPid(pid: number): number | null {
try {
const status = readFileSync(/proc/${pid}/status, 'utf8')
const m = status.match(/^PPid:\s+(\d+)/m)
return m ? parseInt(m[1], 10) : null
} catch {
return null
}
}
const bootGrandparentPid = process.platform === 'linux' ? readParentPid(bootPpid) : null

setInterval(() => {
let parentOrphaned = false
if (process.platform === 'linux' && bootGrandparentPid != null && bootGrandparentPid > 1) {
const gp = readParentPid(bootPpid)
parentOrphaned = gp === null || gp !== bootGrandparentPid
}
const orphaned =
(process.platform !== 'win32' && (process.ppid !== bootPpid || parentOrphaned)) ||
process.stdin.destroyed ||
process.stdin.readableEnded
if (orphaned) shutdown()
}, 5000).unref()

I have applied this fix locally and confirmed it resolves the issue.

Error Messages/Logs

Steps to Reproduce

## Steps to Reproduce

1. Configure the Telegram plugin
2. Start and close 3+ Claude Code sessions
3. Run: ps aux | grep 'bun server.ts'
4. Observe multiple zombie processes, each consuming 40-100% CPU

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.168

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

_No response_