[bug]: Orphaned processes remain after task deletion

[rabanspiegel]

Bug Description

When a task is deleted, any running terminal processes (like npm run dev) in that worktree aren't killed. The processes keep running and hold onto ports.

Steps to Reproduce

1. Create a new task
2. Run npm run dev (or any long-running process) in the task's terminal
3. Delete the task from the sidebar
4. Check lsof -i :3000 - process is still running on the deleted worktree

Actual vs Expected Behavior

Actual: Process keeps running after task deletion, blocking port 3000
Expected: All processes spawned in a task's terminal should be killed when the task is deleted

emdash Version

0.3.53

Operating System

macOS 15

Additional Context

Found this when port 3000 was blocked by a Vite server running on a worktree that no longer exists as a task. Had to manually kill the process.