Promote Stanford 196-class identifier to canonical submission (#33)

Bake metrics narrative into submission notebook (§2.4–§2.6, §3.3, §4.1, §11.2) (#29)

Pre-render Mermaid diagrams + bake preview outputs into submission notebook (#28)

Phase 6: VMMRdb identifier extension (196 → up to ~9,170 make/model/year)

Initial commit: end-to-end car damage + repair-cost predictor