CAGLoader.Load() now reads Data/objects/index.json (BuildTree) and only
falls back to live type instantiation for entries missing from the
cache (stale-cache warning) or when the index file itself is absent
(LoadLegacy, the original categorization.json live-load, moved verbatim).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
