Decode metadata coded indexes once into null, valid or invalid facts. Migrate
all existing consumers and remove parallel token and failure-reason decoders.
Keep required-null policy with each column, preserving tokens, reason text,
offsets, issue ordering and readable partial metadata.
Retain known table/row coordinates even when invalid; TypeRef regressions
preserve row-zero and out-of-range enclosing facts without granting validity.
Attribute naming consumes the same validated constructor coordinate.
Validation: metadata/member/native-boundary/signature source suites and public
CLI/MCP recovery workflows passed; static, docs and duplication checks passed.
morluto
ce3c27fe92