feat(M14.7): add AdS radial pointwise double copy

[jagg-ix]

Scope

Adds the AdS radial/boundary field layer above the merged M14 AdS-normalized double-copy model.

• transports continuous BCJ numerator fields with a Poisson radial semigroup;
• verifies semigroup composition, constant preservation, pointwise Jacobi closure, and convergence to boundary data;
• checks slice-wise weighted generalized-gauge invisibility and color-replacement symmetry;
• composes the D3 compactification coupling with BCJ, GKP mass/dimension and two-point scaling, Complex-Einstein, and Ryu--Takayanagi normalizations;
• explicitly verifies that the BCJ amplitude is not identified with RT entropy;
• adds standalone registration, test, formal ledger, ZIL graph, and documentation.

Formal authority

• jagg-ix/entropic-physlib-private
• branch entropic-physlib-linear-full
• tip 35f98f147771a4e250ec01b4cbf2afab72313db7
• current BCJ, EMComplexEinsteinAdSCFT, and GKP--Witten source blobs are pinned in the ledger.

Toolchain

• Lean 4.31.0 / leanprover/lean4:v4.31.0
• jagg-ix/zil-lean@6daee2698304feb203c6adb91b2e8853613f85b5

Validation

pytest -q tests/test_m14_ads_radial_pointwise_double_copy_m147.py
1 passed

The study closes all 9 acceptance groups.

Claim boundary

The radial carrier is linear and harmonic. This PR does not prove AdS/CFT, construct an interacting Witten functional, identify amplitudes with entropy, or establish a global/loop-level AdS double-copy theorem.

Merge audit

• targets main directly;
• based on 93607ae7c147e071fe62d6f4c0a2d182f276477d;
• six new files only;
• no CI/workflow changes;
• no file overlap with M14.5 or M14.6.

Recommended merge order: M14.5 → M14.6 → M14.7. This branch remains executable against current main because it imports no files from the companion branches.