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;; sui-spec/specs/module_system.lisp — typed border for the Nix
;; module system. Three authoring surfaces compose:
;;
;; (defoption-type ...) — one entry per lib.types.<X>
;; (defpriority ...) — one rank in the priority lattice
;; (defmodule-eval-algorithm ...) — the fixed-point pipeline
;;
;; Implementation is M2 work. This file names the contract;
;; sui-eval and sui-bytecode will both drive this exact spec when
;; the impl lands, so they cannot drift.
;; ── Priority lattice ──────────────────────────────────────────────
;;
;; Numerically, lower :level = higher priority. Matches cppnix's
;; lib.modules priority convention.
;; ── Option-type registry — the cppnix-canonical types ────────────
;;
;; Every NixOS / nix-darwin / home-manager option lives in one of
;; these types (or a composition of them). Each declares a merge
;; strategy + acceptance check.
;; ── Algorithm: cppnix module-eval fixed point ────────────────────
;;
;; Eight phases left-to-right. Each operates on the typed
;; EvalModulesArgs scratchpad; later phases consume slots earlier
;; phases populate. M2 interpreter implements each phase against
;; sui-eval's lazy Value type.