Validation

Each physics source carries at least one test pinned against a published benchmark, an analytical limit, or a cross-implementation cross-check (the reference_pinned marker in the test suite). The pages below record the anchor, the tolerance and its rationale, and the discrimination guards for each source. Full-run regression against the frozen blackbody50 reference complements these per-source anchors (tests/test_regression.py).

Source	Anchor	Test
`interp.c`	Analytical limit	`test_affine_data_reproduced_exactly_including_last_node`
`eos_lookup.c`	Cross-implementation cross-check	`test_melt_density_matches_independent_bilinear_evaluation`
`eos_composite.c`	Analytical limit	`test_fusion_equals_liquidus_minus_solidus_and_phi_is_linear_in_entropy`
`eos.c`	Cross-implementation cross-check of the loaded melt phase boundary against an independent read of liquidus_A11_H13.dat (Andrault et al. 2011 liquidus with the Hirschmann 2013 solidus companion).	`test_phase_boundary_matches_independent_table_read`
`eos_adamswilliamson.c`	Analytical limit	`test_density_matches_the_closed_form_profile`
`mesh.c`	Analytical limit	`test_pressure_profile_matches_adams_williamson_closed_form`
`matprop.c`	Analytical limit	`test_viscosity_recovers_configured_end_members`
`energy.c`	Analytical limit	`test_disabled_transport_mechanisms_carry_zero_flux`
`ic.c`	Analytical limit	`test_prescribed_adiabat_entropy_sets_the_initial_profile`
`bc.c`	Analytical identity	`test_prescribed_flux_bc_echoes_value_and_inverts_emissivity`
`atmosphere.c`	Analytical limit	`test_grey_body_flux_matches_stefan_boltzmann_limit`
`rheologicalfront.c`	Analytical self-consistency	`test_front_location_is_consistent_with_melt_fraction_profile`
`twophase.c`	Analytical identity	`test_global_melt_fraction_is_the_mass_weighted_profile_mean`
`reaction.c`	Analytical conservation	`test_elements_conserved_across_each_reaction_pair`
`rhs.c`	Analytical self-consistency	`test_reported_dsdt_matches_finite_difference_of_outputs`