Geometric Rigidity in Moduli Stacks of Algebras

We study quadratic moduli schemes $X$ of algebra laws on a fixed vector space $W$ under the transport-of-structure action of $GL(W)$ on $Hom(W^{\otimes 2},W)$. We construct an intrinsic three-term deformation complex on $X$ whose fibers encode transverse first-order classes and primary obstructions, and whose cohomology agrees on the operadic loci with the standard low-degree deformation cohomology (à la Gerstenhaber and Nijenhuis–Richardson). We then define a canonical quadratic map ${\kappa }_{2,\mu }^{inc}\text{\hspace{0.17em}⁣}:H_{inc}^2(\mu )\to H_{inc}^3(\mu )$ that controls second-order lifts modulo isotriviality. If $\mu$ is smooth point in a reduced component and $({\kappa }_{2,\mu }^{inc}{)}^{-1}(0)=\{0\}$, then the $G$-orbit of $\mu$ is Zariski open in that component. This provides a coordinate-free explanation of Richardson-type geometric rigidity even when the second deformation cohomology does not vanish.