Deep feasibility validation across 7 dimensions by a Council of Seven Sages (Think Tank). Postdoctoral-level research rigor applied to scenario validation. Validates technical claims, quantitative assumptions, systemic risks, technology maturity, infrastructure limits, integration feasibility, and economic viability. Use when validating approved scenarios before roadmap commitment, when stakeholders need confidence in technical achievability, or when "Phase 3b" / "feasibility" / "think tank" / "7 sabios" is mentioned.