Heliocentric Sparse Law Primer: Synodic Phase Dependence, Multi-Body Universality, and the Three-Factor Law from Mercury to Titan

V4.0 (March 2026): Revised terminology and epistemic framing throughout. Definitional identities relabeled as Propositions. Classification language updated. Mechanism descriptions qualified as proposed interpretations. License updated to AGPL-3.0-or-later. Scientific conclusions unchanged. v3.0 (March 2026): Revised for consistency with classification theorem v7.0. Demoted empirical results from Theorem to Observation/Conjecture. Corrected gamma normalization convention. Updated DOI cross-references to concept DOIs. Added self-DOI to author block. Qualitative conclusions unchanged. Extension of the sparse law to heliocentric relay architectures across the solar system. An eleven-experiment campaign covering…