Goldens, refusals, store read, keys, domains at every constructor and every door (CultLib
MessagePack, MessagePack Standard, System.Text.Json), factories-only reflection, deepest chain
the 256 bound admits. Goldens are linked from crates/thing-contract/tests/goldens, read only.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>