pinwheel: Add dagbok Emacs client

Built from the dagbok flake's Emacs overlay, reading the shared token
from agenix.

hosts/pinwheel/modules/emacs/default.nix

@@ -8,6 +8,8 @@ let
     alwaysEnsure = true;
     alwaysTangle = true;
 
+    override = inputs.dagbok.overlays.emacs;
+
     extraEmacsPackages = epkgs: [
       epkgs.flymake-go-staticcheck
       epkgs.tree-sitter-langs
@@ -43,4 +45,10 @@ in
   };
 
   environment.systemPackages = [ pkgs.ripgrep ];
+
+  age.secrets."dagbok-token" = {
+    file = ../../../../secrets/manatee/dagbok-token.age;
+    owner = "alex";
+    group = "users";
+  };
 }