PixelHelm plugin family 2.1.0 Plugin-family feature release. The standalone Python distribution is unchanged at 0.1.2 and PyPI still serves 0.1.1; these are separate version lines and this cut deliberately carries no Python release. Shipped: the four browser-arm floor validators and the structural output-floor gate; judge, sign-off, run and per-juror record machinery with a validate-then-write contract; behaviour-level verification (scroll capture, frame time, lab CWV, keyboard traversal); the capability ledger and baseline regression memory; the intent-elicitation gate; and the validation program's committed experiment trail with its adversarial critique.