🔺 Ch.11 — Tetrahedron (Fire) [Lane D] · refs #30

# Ch.11 — Tetrahedron

**Part**: III | **Lane**: D | **Refs**: #30 · #63

## Rule of Three
1. Core — tetrahedral group A4
2. Sacred — 4-vertex construction
3. Philosophy — Plato's Fire
4. Empirical — sp3 hybridization
5. Image — tetrahedron

## Acceptance
- [ ] ≥8 pages | `Closes #75`