rlmesh.adapters.Advisory
One non-fatal adapter advisory: a message plus a severity tier.
severity is "info" for benign hints (an authoring nudge, an
explicitly-requested lossy step) and "caution" when the adapter
substituted or fabricated model-visible data (a role-rebound camera, a
zero-filled frame) — the tier an eval harness may want to hard-fail on.
str(advisory) is the message.