Implements the `agent stop` command for stopping agents.
Features:
- Stop a specific agent by ID (with prefix matching)
- --all flag to stop all running agents
- --cwd flag to stop all agents in a specific directory
- Cancels running agents before terminating them
- Graceful error handling for partially failed stops
Usage:
paseo agent stop <id>
paseo agent stop --all
paseo agent stop --cwd ~/dev/paseo
Mohamed Boudra
b040e2fc6d