v3.0.0 Production Release: Hardened framework, strict tool validation, test suite robustification

fix: real-model robustness — benchmarks/validate_real.py

Track 2: validation suite with improvement curves, cold/warm, transfer, adversarial

Track 2: validation suite with improvement curves, cold/warm, transfer, adversarial

Track 2: validation suite with improvement curves, cold/warm, transfer, adversarial