Our engine pins are already theirs. The embedder, the eleven-patch
DMSAA/external-texture series, KMS and the GBM atlas path are the
expensive parts and they are readable.
Their lock is a compositor-internal bool with PAM dlopened in-process
and no ext-session-lock served at all. It is invisible to logind and
sessiond, and it gates input against every caller including Annie.
viewtop serves the protocol; sessiond keeps the decision.
Also adds TASK-41 (attested producers), raised out of grip bring-up.
