fix(direnv): remove dependence on local script

Signed-off-by: Cameron Smith <cameron.ray.smith@gmail.com>

Author: cameronraysmith

.envrc

@@ -1,5 +1,3 @@
-./scripts/set-git-env.sh
-
 if has nix; then
   watch_file \
     nix/modules/*.nix \
@@ -9,9 +7,25 @@ if has nix; then
   then
       echo "nix flake could not be built; update flake.nix and run direnv allow/reload" >&2
   fi
-  printf "\nrun \`nix flake update --impure && nix flake check --impure\` to update the flake lockfile."
-  printf "\nuse \`direnv revoke\` to unload the dev environment or \`direnv allow\` to reload it.\n\n"
+  
+  
+  printf "\nrun \`nix flake update --impure && nix flake check --impure\` to update the flake lockfile.\n"
+  printf "use \`direnv revoke\` to unload the dev environment or \`direnv allow\` to reload it.\n"
 else
+  # The equivalent nix shell application set-git-env is now run automatically
+  # via shellHook and the variables are already exported to the environment.
+  # Fallback to the local script if Nix isn't available or disable if it's not
+  # executable.
+  if [ -f ./scripts/set-git-env.sh ]; then
+    if [ -x ./scripts/set-git-env.sh ]; then
+      ./scripts/set-git-env.sh
+    else
+      echo "Warning: scripts/set-git-env.sh exists but is not executable. Run 'chmod +x ./scripts/set-git-env.sh' to make it executable."
+    fi
+  else
+    echo "Warning: scripts/set-git-env.sh not found and Nix not available"
+  fi
+  
   printf "\nNix is not installed or not available in your PATH. You can either:\n"
   printf "1. Run \`make bootstrap\` from the Makefile to set up nix\n"
   printf "2. Visit https://nix.dev to find instructions on installing nix\n\n"