ORIGINAL WORKED REFERENCE

The result set is {1:4, 2:9, 3:16, 4:25}; its value sum is 54. Arrival order may vary. The source uses two workers and a completion coordinator. Go compilation, runtime and race-detector checks were not performed in the preparation environment.

CRITICAL CONDITION
No worker closes the shared results channel prematurely and every job ID has exactly one result.

LIMITS
This is a finite local concurrency example, not a resilient task queue or a benchmarked service.

This reference is not a learner submission or proof of provider-course completion. See material-verification.json in the production package for actual preparation checks.
