🥚 Ch.5 — Golden Egg (Egg of Life & Octonions) [Lane D] · refs #30

# Ch.5 — Golden Egg

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

## Rule of Three
1. Core — octonion algebra + Egg of Life
2. Sacred — seven-sphere configuration
3. Philosophy — Baez on octonions
4. Empirical — E8 connection
5. Image — Egg-of-Life figure

## Acceptance
- [ ] ≥8 pages | `Closes #69`