feat(agents): add design skill

flake.lock

@@ -562,11 +562,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1785385819,
-        "narHash": "sha256-kiDhor5OhBfQqBuzP5ClVNCpC6HxHsO/6Gd+BTSY5dY=",
+        "lastModified": 1785452609,
+        "narHash": "sha256-28OYRZJuSwKm46PSyJrU2mjDs8O8FFoHH5D0ZLpaPzU=",
         "ref": "refs/heads/main",
-        "rev": "fbd009337d9f18dc03b63916cf843b08a2b7b468",
-        "revCount": 28,
+        "rev": "f72c2622297651def9c0652a75b15a780d7ec2f9",
+        "revCount": 29,
         "type": "git",
         "url": "https://git.alexion.dev/alexion/skills"
       },

modules/agents/skills.nix

@@ -12,10 +12,12 @@ let
   # The skills installed globally, as derivations from the skills flake.
   # wiki reads the personal Obsidian vault, and consume mines a source into it.
   # grill interviews the operator relentlessly to resolve a plan before building.
+  # design-skill drafts and audits Agent Skills for structural predictability.
   skills = with inputs.skills.packages.${pkgs.stdenv.hostPlatform.system}; [
     wiki
     consume
     grill
+    design-skill
   ];
 in
 {