DefaultEfferentGate is a capability/shape pre-filter only; it does not
lower decoded actions into safety/ethics pack verdicts (ADR-0198 §3 /
§1.2 Gap B). ModalityRegistry.decode/decode_batch now refuse fail-closed
any emission through a gate whose enforces_action_verdicts is False,
unless an explicit allow_unverified_efferent sandbox opt-in is set.
A real motor decoder thus cannot emit through the capability-only gate;
the §3 verdict-lowering gate must be built and installed first. No
production caller of the decode path exists today, so this closes the
latent hazard before a motor decoder makes it load-bearing. Adds two
falsifiable tests (fail-closed refusal; verdict-enforcing gate allowed).
Disjoint from the GSM8K serving path.
ADR-0181/0197/0208/0209 were marked Proposed despite test-backed
afferent implementations merged to main; flip to Accepted with
verifiable Implementation lines (paths + PRs + falsifiable tests).
ADR-0198's 'no implementation' status was stale (Gap A protocol
change + baseline efferent gate landed in #541); correct it and
document the deferred §3 safety/ethics verdict-lowering as an
explicit blocking obligation before any motor decoder mounts.
