privacy: scrub host chip/OS from model card

README.md

@@ -87,7 +87,7 @@ pip install coreai-catalog && coreai-catalog install pi0-base-gemma
 
 - **Gate A (structure): passed** — the bundle's layout + metadata were
   validated on real hardware; the graphs load.
-- **Gate B — action_parity: 99.6% min chunk-cosine** vs the fp16 reference over 4 frames of `recorded episodes`, 10-step, fixed-noise (measured on Apple M4 Max).
+- **Gate B — action_parity: 99.6% min chunk-cosine** vs the fp16 reference over 4 frames of `recorded episodes`, 10-step, fixed-noise (measured on Apple Silicon).
 - This certifies the export is **numerically faithful to the source policy** — it
   does **NOT** certify real-world task success, embodiment transfer, or
   closed-loop stability. Closed-loop success-rate eval (LIBERO/ManiSkill):