libSceJxrParser technical debt

Callable exports - Seven 3.20 callable NIDs are import-resolution declarations only. One NID also appears in the 13.60-labelled inventory; other NIDs differ across versions. Their signatures and behavior are unverified; parameterless int declarations are placeholders, not verified ABI contracts. Every entry throws through NotImplemented_nid_no_patch. No runtime functionality is implemented. Data exports require separate layout and ownership analysis.