Rename grapho to pal, add onboard command, fix interactive input

- Rename grapho → pal across entire codebase (CLI, NixOS module,
  flake, docs, config paths)
- Add `pal onboard` interactive setup wizard with 4 steps:
  device, config repo, sync, backups
- Shows current setup summary when re-running onboard on an
  existing installation with warnings about what will change
- Fix askConfirm/askInput to read from /dev/tty so interactive
  prompts work correctly
- Remove || operator usage in askConfirm (not reliable in Lux)
- Add pal package to nix develop shell
- Document ~/.config/pal/ directory structure in README

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

flake.nix

@@ -42,7 +42,7 @@
 
       # Shared modules for all hosts
       sharedModules = [
-        ./modules/grapho.nix
+        ./modules/pal.nix
         ./modules/nb.nix
         ./modules/syncthing.nix
         ./modules/backup.nix
@@ -66,36 +66,36 @@
         };
 
     in {
-      # Grapho CLI package
+      # Pal CLI package
       packages = forAllSystems (system:
         let
           pkgs = nixpkgsFor.${system};
           luxPkg = lux.packages.${system}.default;
         in {
-          grapho = pkgs.stdenv.mkDerivation {
-            pname = "grapho";
+          pal = pkgs.stdenv.mkDerivation {
+            pname = "pal";
             version = "0.1.0";
             src = ./cli;
 
             nativeBuildInputs = [ luxPkg pkgs.gcc ];
 
             buildPhase = ''
-              ${luxPkg}/bin/lux compile grapho.lux -o grapho
+              ${luxPkg}/bin/lux compile pal.lux -o pal
             '';
 
             installPhase = ''
               mkdir -p $out/bin
-              cp grapho $out/bin/
+              cp pal $out/bin/
             '';
 
             meta = {
               description = "Personal data infrastructure CLI";
-              homepage = "https://github.com/user/grapho";
+              homepage = "https://github.com/user/pal";
               license = pkgs.lib.licenses.mit;
             };
           };
 
-          default = self.packages.${system}.grapho;
+          default = self.packages.${system}.pal;
         }
       );
 
@@ -144,7 +144,7 @@
                 else
                   echo "Error: Cannot find setup script"
                   echo "Run from the repo directory, or clone it first:"
-                  echo "  git clone ssh://git@your-server:2222/you/grapho.git"
+                  echo "  git clone ssh://git@your-server:2222/you/pal.git"
                   exit 1
                 fi
               fi
@@ -173,6 +173,7 @@
 
             packages = [
               lux.packages.${system}.default
+              self.packages.${system}.pal
             ] ++ (with pkgs; [
               # Tier 2: Notes & Sync
               nb              # Notebook CLI
@@ -203,12 +204,11 @@
             ]);
 
             shellHook = ''
-              printf '\033[1m%s\033[0m\n' "Ultimate Notetaking, Sync & Backup System"
+              printf '\033[1m%s\033[0m\n' "pal - Your personal data, everywhere"
               echo ""
-              echo "Get started:  ./setup"
-              echo "Pair mobile:  ./setup mobile"
-              echo "Sync:         ./scripts/usync"
-              echo "Status:       ./scripts/ustatus"
+              echo "Get started:  pal onboard"
+              echo "Status:       pal status"
+              echo "Help:         pal help"
             '';
           };
         }
@@ -216,7 +216,7 @@
 
       # Export modules for use in other flakes
       nixosModules = {
-        grapho = import ./modules/grapho.nix;
+        pal = import ./modules/pal.nix;
         nb = import ./modules/nb.nix;
         syncthing = import ./modules/syncthing.nix;
         backup = import ./modules/backup.nix;