/work-tournament -- Parallel Implementation Tournament

Implement a task multiple different ways in parallel, gate each candidate on a deterministic oracle, evaluate the survivors from their real diffs, and apply the best one — then re-verify it in main.

This is the implementation arm of the quality system. It is the build-phase tournament referenced by ../work/references/workflow-mode.md §2 ("Implementation work uses work-tournament … in worktrees"). It operationalizes lessons L1–L8 from ../work/references/anti-error-lessons.md; the lesson tags below (L1…L8) point back there — do not duplicate that content, read it.

Workflow shape

PARALLEL-BARRIER → then a short PIPELINE tail.