Encode emits native-typed JSON ([10,20], [true,false], ISO dates); Decode reads
both old (array-of-strings) and new forms. Existing data normalized via an
idempotent central MS SQL startup normalizer, active site SQLite normalization in
the InstanceActor override-load path, and normalize-on-import for bundles.
Approved via brainstorming (Approach B, thorough).
Joseph Doherty