;; next/genesis/validators/signature.sx
;;
;; Stage 2 of the validation pipeline per design §14. Verifies the
;; activity signature against the time-relevant public key in the
;; actor-state projection. Bootstrap entry; the kernel dispatches
;; to envelope:verify_signature/2 (Step 2c) when running in
;; Erlang-on-SX mode. Per design §9.6 the lookup is timestamp-aware
;; — key validity is evaluated at :published, not "now".

(DefineValidator
  :name "signature"
  :doc "Signature verification. Picks the signature suite by\n        :signature :algorithm, fetches the key with id ==\n        :signature :key_id that was active at :published from\n        the actor-state projection, then dispatches to the\n        suite's :verify body."
  :predicate (fn (act) true))