docs: HF model card — best-of-both front-matter derived from manifest

rskill.yaml: sync to OpenRAL namespace + current schema (joint_units, evaluated_tasks, ADR-0071)

fix(manifest): explicit embodiment_tags ["any"] (ADR-0071)

docs: add generated SKILL.md discovery view

NF4 pre-quantized Robometer-4B reward rSkill (ADR-0057): bit-identical, meta-loadable

initial commit