feat(agents): add wayfinding skills

modules/agents/skills.nix

@@ -13,11 +13,15 @@ let
   # 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.
+  # wayfinder, research, and prototype guide work from exploration through validation.
   skills = with inputs.skills.packages.${pkgs.stdenv.hostPlatform.system}; [
     wiki
     consume
     grill
     design-skill
+    wayfinder
+    research
+    prototype
   ];
 in
 {