The worker-start hook's `start` subcommand forks a daemon then SIGKILLs
its own process group, killing bun-runner.js before it can report exit 0.
Since all SessionStart hooks run in parallel, the context hook also fails
because the worker isn't listening yet.
Fix:
- worker-start: continue after the SIGKILL via `;`, poll the worker
health endpoint until ready, then output valid JSON (exit 0)
- context: wait for worker health before attempting to fetch context
Fixes#1505
nimesh-kumar-sh
ed444dfec7