D2d-C3 — Companion to D2d, Volume 3: Bell Inequality and Quantum Correlations Classical Bound · su(2) Algebra · EPR Mechanism · CHSH Violation

D2d-C3 covers the Bell inequality structure of the Triniton discrete framework. Results established: (I) R4 — CHSH ≤ 2 from local factorization, with explicit verification on the classical Triniton sector and the geometric note on spatial rotations; (II) dim=2 qubit from M2+PE; (III) su(2) algebra from step transitions in Im(Q); (IV) ∣Ψ𝑇+⟩from PE+unitarity+IV.N2+M1 — four-proposition derivation; (V) E(a,b) from su(2) — algebraiccomputation with declared convention; (VI) CHSH = 2√2 with explicit angle assignment; (VII) finite-N correction with conservative bound 4π/N. Zero free parameters. Zero ad hoc adjustments.