card: synthetic-first physics benchmark, rights-clean, regenerable, params-explicit

README.md

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+---
+license: apache-2.0
+tags: [szl-holdings, physics, benchmark, receipts-backed, synthetic]
+---
+
+# physics-bench-micro
+
+> 120 synthetic physics problems (kinematics, energy, circuits) with programmatically
+> verified answers - the estate's first physics benchmark, rights-clean by construction.
+
+## Why synthetic
+
+Every problem is generated and every answer is *computed*, not copied - zero rights
+questions, zero contamination from published benchmarks, infinitely regenerable with
+a new seed. Synthetic first, then rights-cleared external microbenches (Matbench,
+WeatherBench 2) on top, per the leader audit.
+
+## The verification contract
+
+Each row carries explicit `params`; `verify.py` recomputes every answer from them -
+a model answer passes only within tolerance. No regex extraction, no ambiguity.
+
+## Honest labels
+
+- **License:** Apache-2.0 (generated by SZL Holdings, no third-party content)
+- **Seed:** 20261110 - a new seed produces a fresh, equally valid battery
+- **Contamination-proof:** regenerable on demand, so leakage is detectable
+
+*Generated by the estate's benchmark lane; answers machine-verified before publish.*