feat(pool): add graceful shutdown support#25
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## New Features
### AgentPool Graceful Shutdown
- `gracefulShutdown()`: Safely stop all agents, wait for working ones to complete
- `resumeFromShutdown()`: Resume agents from a previous graceful shutdown
- `registerShutdownHandlers()`: Convenience method for SIGTERM/SIGINT handling
### New Types
- `GracefulShutdownOptions`: Configuration for shutdown behavior
- `ShutdownResult`: Detailed result of shutdown operation
## How It Works
1. Categorizes agents into READY and WORKING states
2. Immediately persists READY agents
3. Waits for WORKING agents with configurable timeout
4. Optionally interrupts agents that don't complete in time
5. Saves running agents list for recovery after restart
## Usage
```typescript
const pool = new AgentPool({ dependencies });
// Option 1: Register signal handlers
pool.registerShutdownHandlers();
// Option 2: Manual shutdown
const result = await pool.gracefulShutdown({
timeout: 30000,
saveRunningList: true,
forceInterrupt: true,
});
// Resume after restart
await pool.resumeFromShutdown(configFactory, { strategy: 'crash' });
```
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
gracefulShutdown()method to AgentPool for safe server restartsresumeFromShutdown()for automatic recovery after restartregisterShutdownHandlers()for SIGTERM/SIGINT handlingGracefulShutdownOptions,ShutdownResultTest plan
Usage
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