Lemma: Reported computation for work package A

wpA/kernel_identification_checks.py exits with status $0$ (about $2$\,s) and prints ALL CHECKS PASSED. It checks: the radial Laplace integral and the damped closed form of $W_0$ (symbolic, with numerical spot checks); the sign of $(s\mp i0{)}^{-1}$; the cancellation of $\mathrm{sgn}(z^0)$ and the coefficients $c$ and $ci\pi$; ${\delta }_0$ and ${E_0}^{\mathrm{A}}$ on $\Omega$; off-cone normalization at $12$ points; numerical spatial Fourier integrals against the closed form; the null-cone chart $s=Q$ on both sheets; the variable regulator of Lemma lem:wpA-varreg (numerical pairing for $a=2+\sin s$ and $a=-(1.5+0.5\cos s)$ at $\tau =10^{-2},10^{-3},10^{-4}$, error decreasing linearly in $\tau$; audit 3); $\square (c/Q)=0$, homogeneity, transposition, propagator normalization; and $r=-i/(8{\pi }^2)$. The output is deterministic (fixed seeds) and is re-generated and compared byte-for-byte by regression_M.py.