[Audit 2026-04-14] Job tracing panic in enqueue path

[yanghao1143]

Summary

Job tracing integration contains a guaranteed panic path.

Findings

• Critical | confirmed SetTracingOption always panic("unimplemented").
  • Evidence: pkg/job/tracing.go:69
• Critical | confirmed EnqueueWithTracing unconditionally calls SetTracingOption, making traced enqueue crash path deterministic.
  • Evidence: pkg/job/tracing.go:94

Suggested Direction

• Implement tracing option injection or remove call path until complete.
• Add unit test for EnqueueWithTracing non-panic behavior.