conformance(loader,report): reject non-standard JSON constants in loads_strict and validate record_digest/build inputs (#648) - #653

Awaiting 1 independent maintainer approval(s) of current head cd9bf9e45ea4ba6744caad5bad76cf789fb107dd; found 0. Branch rules and specification governance also apply.

On December 2, 2026, GitHub will restrict `pull_request_target` on public repositories by default. To continue allowing the event trigger, configure an Actions policy. Learn more: https://gh.io/securely-using-pull_request_target#default-policy-for-pull_request_target