## Summary
After #2289, Full Suite shard 4 still failed on the **OMP** twin of the
Grok process-lifecycle stress test (`import("../index.js")` × 15 under
shard transform load → 5s timeout).
Apply the same fix class as grok-runtime:
- Symbol.for exit reaper on `process-manager`
- Stress test reimports that module
- 15s timeout for cold transform
## Test plan
- [x] Local OMP process-lifecycle green
- [ ] PR gate
- [ ] Post-merge Full Suite
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Bug Fixes**
- Improved cleanup of OMP ACP processes when the application exits.
- Prevented duplicate exit handlers and excess listener growth during
runtime reloads.
- Preserved reliable process lifecycle behavior under repeated module
loading.
- **Tests**
- Added lifecycle coverage for repeated process-manager reloads.
- Optimized the stress test to complete more efficiently while retaining
cleanup assertions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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