PiPER retention v0.2 · grip versus stationary hold

Compare three fixed PiPER hold rules after identical evidence-gated test lifts. The frozen 36-attempt study records native five-second grip retention of 2/12, 4/12 and 4/12 for measured, issued and Cartesian targets; grip plus TCP stationarity is 2/12, 0/12 and 0/12. The Cartesian grip count includes its terminal fallback. No controller is promoted and no learning or hardware qualification is claimed.

Includes complete native records, independent command/predicate/pose audit, CPU measurements, failure cases and source-only reproduction tools. The existing wheel, stable main and physical interfaces are unchanged.

Validation: 77 core tests; 13 independent-audit tests; bounded packaging and publisher tests; all36 native attempts valid; 720,000 native rows and 36,000 commands independently checked; 12/12 shared acquisition prefixes exactly matched; real browser report verification.

Research: https://research.dvidia.org/papers/piper-retention-v02/
Evidence: https://huggingface.co/datasets/Dvidia/piper-retention-v02

Runtime source: 6ab5e34
Frozen protocol: a6b16cce45f364995787baf456d6c3e0b858c8572402957c777c784beeaf4565
Independent audit: 710516172db5e7851ed88a37278d8696271860b84643b456fcb2b3e64b2bb5ec