ztp-runtime — the Reflex

1000 Hz spinal cord for a VLA / GNC planner. Zero crate dependencies. Pure Rust stdlib. Compiles to a C library you load next to the motor.

Your policy thinks at 5–50 Hz. Physical failure (micro-slip, RF drop, e-brake) happens in ~2 ms. This crate is the thing that catches it.

VLA / GNC  (5–50 Hz)     ztp-runtime  (1000 Hz)     actuator
      intent      →      friction / stop / force     →   metal
                         projection on-die

Sibling: genesis-core is the Forge (sealed failure-boundary Monte Carlo). This crate is the thin Reflex only. Do not merge them.

zerotrustphysics.com · commercial: Reflex Runtime eval

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Build

cargo build --release
# macOS  → target/release/libztp_runtime.dylib
# Linux  → target/release/libztp_runtime.so
# Windows → target/release/ztp_runtime.dll

cargo run --release    # microbench

Release profile: opt-level=3, LTO, codegen-units=1, panic=abort, strip.

Demo the VLA gap (Python ctypes, this crate):

cargo build --release
python3 examples/python/vla_somatic_bridge.py

12 N policy drops the part. Same command with the reflex on catches micro-slip at 16 ms and holds (45 N clamp). Other ctypes examples: examples/python/README.md. C eval box (hold / tissue / machine) is the Spectrum sibling grokd/public/ztp-runtime-eval/.

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C FFI

All entry points are #[no_mangle] extern "C" in src/lib.rs. That source is the ABI.

Export	Domain
ztp_dexterous_evaluate_grasp	Tactile grasp / slip
ztp_surgical_evaluate_grasp	Surgical force ceiling
ztp_micro_evaluate_release	Micro-assembly release
ztp_drone_step	Multirotor step
ztp_bluerov_step	UUV / ROV step
ztp_marine_evaluate_state	Mackenzie / hydrostatic / Snell (64 B)
ztp_directed_energy_step	Gimbal / jitter
ztp_terran_evaluate_contact	Soil contact
ztp_orbital_step_6dof	Orbital translation
ztp_orbital_step_attitude	Orbital attitude
ztp_atheric_handshake	RF coherence
ztp_mars_step	Mars EDL step
ztp_compounding_fkpp_step	FKPP
ztp_compounding_compute_viscosity	Ostwald–de Waele
ztp_compounding_audit_shear	Shear audit
ztp_compounding_compute_dissolution_rate	Noyes–Whitney
ztp_compounding_update_autonomic_tone	Autonomic tone
ztp_compounding_seal_state	State seal

#[repr(C)] structs sit next to each export. Python ctypes layouts: examples/python/.

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Domains

Module	Physics
dexterous	Tactile grasp, surgical auditor, micro-release
drone	Multirotor dynamics step
bluerov	Underwater ROV step
marine	Mackenzie 1981, ρgz, thermocline Snell
atheric	Friis / Shannon / hop seed
terran	Boussinesq soil contact
orbital	6DOF + quaternion attitude
mars	CO₂ EDL step
directed_energy	Gimbal / jitter
compounding	FKPP, Ostwald–de Waele, Noyes–Whitney

lib.rs also carries a deterministic LCG and a hand-rolled SHA-256 ProofChain (no sha2 crate).

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Design

• CPU sequential integrators on purpose — single-body edge loops.
• No Parquet, no corpus, no Monte Carlo. That is genesis-core (the Forge).
• Not a cloud API. You load a dylib.

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License

Dual MIT / Apache 2.0.

genesis-core · ZeroTrustPhysics.com