Artian A2 Blind Tabletop Gravity Tests

Three tabletop ways to ask whether gravity carries a source-side ledger signature. This paper develops three blind laboratory protocols for the A2 Law of Endurance: an equal-action/unequal-load interferometer, an echo-cancelled covariance test, and a quantum-source holonomy test. The common object is an A2 address packet whose ordinary GR/QM laboratory shadow is held fixed while the registered source/access ordering is varied. \[ \boxed{ \mathfrak T_{A2,r} =(\mathcal O_{A2,r},\mathcal P_r,\mathcal C_r,\mathcal D_r,q_r, \Sigma_r,H_{\rm GR/QM,r},H_{A2,r},\mathcal K_r) } \] Version 2.0 makes the experimental verdict fail closed. Every row must pass \[ \boxed{ G^{\rm eligible}_{A2,r} =G_{\rm packet}G_{\rm regime}G_{\rm GR/QM}G_{\rm artifact} G_{\rm reversal}G_{\rm covariance}G_{\rm power}G_{\rm chronology}. } \] The regime certificate must be computed from source history, apparatus geometry, calibration, and frozen noise information without using the target residual. An ineligible or underpowered row cannot falsify A2, and a target-like result cannot promote an ineligible row. The complete predeclared channel vector is retained: \[ \boxed{ \mathbf y_r=(\Theta_r,V_r,C_r,K_r,\mathbf s_r). } \] A reproducible secondary signal either invalidates the primary forward model, producing an ineligible packet, or survives it as a qualified cross-channel anomaly. It is neither discarded nor relabelled after unblinding. The paper therefore separates five outcomes: ineligible packet, registered A2 access-map failure, A2 candidate, qualified other/cross-channel anomaly, and ambiguous or underpowered result. \[ \boxed{ {\partial\mathcal O_{A2,r}\over \partial\{\mathbf y_r,\Sigma_r,\text{verdict}\}}=0. } \] The protocol design and verdict governance are closed. Apparatus-specific numerical sensitivity, prospective power, and blind laboratory data remain open experimental work. Stable anchors: Concept DOI: 10.5281/zenodo.20772326 Experimental governance: 10.5281/zenodo.21775175 Main book: Quantum Traction Theory: Main Book v10.01 Website: quantumtraction.org Included files: PDF paper, Version 2.0 Reconstruction ZIP containing LaTeX source, style file, metadata, render audit, and SHA-256 manifest