feat(BMT): coupled Tier-3 donor linearization for the 2M+P3 ManualJacobian#744

Draft

haakon-e wants to merge 36 commits into

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he/rosenbrock-manual-tier3

Commits on Jul 11, 2026

feat(P3): Gauss-Legendre quadrature and velocity-aware integration bounds
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test(P3): zero allocation budgets for the 2M+P3 GPU kernel and collision benchmark
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test(P3,2M): cross-check ice self-collection; cover x_min = 0 mass limit
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docs(2M): add quadrature_order to the Microphysics2MParams signature line
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test(BMT): benchmark the full 2M+P3 bulk_microphysics_tendencies entry
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perf(P3): split collision integrals at velocity breakpoints
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perf(P3): add a decay-scale breakpoint to the P3 integral bounds
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perf(P3): place the wet-growth onset on outer subinterval boundaries
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perf(P3): lower the default quadrature order to 6
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refactor(P3): collision-rate kernel and velocity-breakpoint queries
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test(P3): commit the quadrature error-study harness
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test(P3,2M): use Gauss-Legendre in the P3 and 2M integral tests
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docs(P3): document collision_cross_section_ice_ice; confirm AD-safe max-freeze clamp
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docs(P3): list ice_self_collection in the API @docs block
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feat(Rosenbrock): unified RosenbrockAverage framework + 2M+P3 exact-AD substepping
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test(GPU): broadcast 2M+P3 Rosenbrock bulk tendencies over ClimaCore fields
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docs: warn on cross-references to undocumented internal helpers
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fix(BMT): warm-rain-only RosenbrockAverage error; document internal helpers
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fix(P3): analytic ForwardDiff derivative for gamma_inc_moment
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fix(Utilities): Float32-robust derivative in the sgs weight sigmoid
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docs(Rosenbrock): correct PR/doc claims and comments; add Rosenbrock allocation/inference test
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test(Rosenbrock): unguard the 2M+P3 exact-AD inference and allocation test
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feat(Rosenbrock): add the 1M donor/coupled/exact modes on the framework
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fix(test): use rosenbrock_exact for the 2M+P3 Rosenbrock GPU kernel
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refactor(BMT): deduplicate the saturation limiter and align 1M naming
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test(BMT): run the 1M Rosenbrock modes in a device kernel
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feat(Rosenbrock): post-solve per-process verbose diagnostics
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fix(BMT): Verbose parity with the wrapped mode on non-finite states
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feat(Rosenbrock): cap the saturation adjustment on max(S_ice, S_liq)
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test(Rosenbrock): show the unlimited cold end state violates saturation
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docs(Rosenbrock): name the coarse-step instability as ice-growth
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perf(BMT): recover the primal tendency from the Rosenbrock Jacobian pass
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feat(BMT): analytic ManualJacobian for the 2M+P3 Rosenbrock substep
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test(BMT): cover rosenbrock_manual and the Tier-1 manual Jacobian entries
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feat(BMT): coupled Tier-3 donor linearization for the 2M+P3 ManualJacobian
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fix(BMT): donor-linearize the collision rain-mass sink in the manual Jacobian
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