feat(agents): add implementation workflow skills

modules/agents/skills.nix

@@ -13,6 +13,7 @@ let
   # grill interviews the operator relentlessly to resolve a plan before building.
   # design-skill drafts and audits Agent Skills for structural predictability.
   # wayfinder, research, prototype, and slice guide work from exploration through implementation tickets.
+  # implement, test-driven-development, and review guide execution and validation once tickets are ready.
   skills = with inputs.skills.packages.${pkgs.stdenv.hostPlatform.system}; [
     grill
     design-skill
@@ -20,6 +21,9 @@ let
     research
     prototype
     slice
+    implement
+    test-driven-development
+    review
   ];
 in
 {