We derive the complete Watson expansion for the Class A stable-area law A (K) ~ CA K^-γA arising in non-holomorphic fractal families of Bird's classification. The expansion is a two-saddle decomposition: the interior saddle at t → 0 produces a convergent hypergeometric series GA (w) = ₂F₁ (1/2, p; p + 3/2; w) in integer powers of w = K^- (1+α) /2, whose Borel transform is entire; the endpoint boundary layer at t → 1 contributes a second convergent series in the incommensurable power w^3/ (1+α) ², generically irrational and invisible to any finite truncation of the Watson series. The leading boundary-layer coefficient is Cbl = (2/3) √ (2 (1+α) ) R^3/2, proved in closed form. A complete set of Watson coefficients cₙ = (1/2) ₙ (p) ₙ / ( (p+3/2) ₙ n!) is derived via Beta recursion and confirmed to machine precision. For Class B we prove CB = 2R exactly from the transcendental boundary equation and show the corrections form an iterated-logarithm series in ln (ln K) /ln K, qualitatively distinct from all other classes and implying an exotic Borel singularity structure. This is Paper 10 in a series on resurgent asymptotics for non-holomorphic fractal families. It closes Open Problems 1 and 2 of Paper 9 (doi: 10. 5281/zenodo. 19222502). All computations performed on Chilly (NVIDIA RTX 3060 Ti, AMD Ryzen 5). Verified scripts: watsoncorrectionᵥerify. py, watsonboundaryₗayer. py, borelₛtokesclassAᵥ2. py, watsonₚadeₘpmath. py, bprimeₛtokesᵥerify. py, classBEnₑxtraction. py. v5 (erratum, 26 Mar 2026): d₁ = (2α−1) /4 in Theorem 3. 1; was (α−1) /4 in v4. One-line algebra fix. No theorem, Cbl, incommensurability result, or numerical table affected except the d₁ column in §3. 2. OP3 of §6. 2 noted as closed in Paper 11.
Michael Bird (Wed,) studied this question.