Restructure README for academic reviewers

- Update citation year from 2025 to 2026
- Lead with research scope, key findings, and quick reproducibility
- Add warning about --use-cifar-stem flag requirement
- Fix all example commands to include --use-cifar-stem
- Document CIFAR-adapted stems rationale and impact
- Add FP32+KD control experiments section
- Explain layer ablation significance (conv1 recovers 30-74%)
- Document TTQ comparison (Phase 6, 18 experiments)
- Update results structure (90 + 63 = 153 total)
- Move development setup and CI badges to bottom
- Preserve all original content, reorganized for reviewers

Author: dariocazzani