Module physics 

Certified physics forge kernels — complete, deterministic compute shaders with exact CPU oracles, naga validation, and GPU certification.

These formalise the previously-orphan src/shaders/{molecular_dynamics,kinematics}.wgsl: nothing in the codebase loaded them, and as written they were incomplete or unsafe — the MD shader updated position but left velocity unchanged (half an integrator), and the kinematics shader read and wrote the same buffer (a data race making the result non-deterministic). The kernels here are corrected (complete velocity-Verlet; double-buffered, Plummer-softened N-body), embedded from the .wgsl via include_str! so there is a single source of truth, graded against a Rust oracle, and runnable on any wgpu adapter.

Deliberately not here (reserved for curation, not faked):

• fluid_dynamics.wgsl — a velocity *= 0.99 placeholder labelled “mock Navier–Stokes”.
• quantum_bio.wgsl — non-compiling (invalid inline-struct syntax, builtin shadowing) and partly demo-grade (one uniform reused as several unrelated physical quantities).

Formalising those two requires a decision on the intended physical model (which fluid scheme; which quantum-biology observables and their real parameterisation) — an out-of-band call that belongs to Timothy, so they are left for that direction rather than dressed up as complete.

Modules

kinematics

Softened inverse-square N-body step as a certified forge kernel.

molecular_dynamics

Velocity-Verlet molecular-dynamics step as a certified forge kernel.