fix(cloud-agent-next): stabilize abort timeout test

[eshurakov]

Summary

• Freeze the system clock in the hanging-abort test before scheduling deadlines.
• Keep the exact timeout assertion deterministic when elapsed wall time would otherwise produce 9,999ms timers.

Verification

• Focused test passed 20 consecutive runs.
• Full wrapper suite passed: 1,425 tests, 0 failures.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (1 files)

• services/cloud-agent-next/wrapper/src/control/sandbox-control-handlers.test.ts

---

_{Reviewed by grok-4.6 · Input: 114K · Output: 7.4K · Cached: 471.9K}

_{Review guidance: REVIEW.md from base branch main}