SEDI Core Identity 0.1.0¶

This is Sam Smith's original SEDI Core schema at ec307cd74, preserved byte for byte with SAID ED7zRxzpuvv89c6jDwgyBNOoW06Ut0wm_8jJQRqKYv_5. It accepts expanded nested blocks only. Bakobo's 0.2.0 amendment added compact SAID-string representations, and Sam's current revision adopted them.