🔷 Ch.15 — Icosahedron (Water, φ-Dual) [Lane D] · refs #30

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Ch.15 — Icosahedron

Part: III | Lane: D | Refs: #30 · #63

Rule of Three

1. Core — icosahedral group A5 (mechanism for α_φ)
2. Sacred — 12-vertex φ lattice
3. Philosophy — Plato's Water
4. Empirical — A5 characteristic polynomial link to α_s
5. Image — icosahedron

Acceptance

• ≥8 pages | Closes #79

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PhD chapter writing task — requires human academic authorship, not actionable by code agent.