**Refactor Nix init into modular scripts and update packaging paths**

* Move the Nix bootstrap from *scripts/init-nix.sh* to *scripts/nix/init.sh* with split-out helpers in *scripts/nix/lib/*
* Update Arch/Debian/Fedora packaging hooks to call */usr/lib/package-manager/nix/init.sh*
* Keep bootstrap behavior the same while improving maintainability and reuse

https://chatgpt.com/share/693c7159-b340-800f-929e-2515eeb0dd03

packaging/arch/PKGBUILD

@@ -51,8 +51,8 @@ package() {
     "$pkgdir/usr/bin/pkgmgr"
 
   # Install Nix init helper
-  install -Dm0755 "scripts/init-nix.sh" \
-    "$pkgdir/usr/lib/package-manager/init-nix.sh"
+  install -Dm0755 "scripts/nix/init.sh" \
+    "$pkgdir/usr/lib/package-manager/nix/init.sh"
 
   # Install the full repository into /usr/lib/package-manager
   mkdir -p "$pkgdir/usr/lib/package-manager"

packaging/arch/package-manager.install

@@ -1,9 +1,9 @@
 post_install() {
-  /usr/lib/package-manager/init-nix.sh || echo ">>> ERROR: /usr/lib/package-manager/init-nix.sh not found or not executable."
+  /usr/lib/package-manager/nix/init.sh || echo ">>> ERROR: /usr/lib/package-manager/nix/init.sh not found or not executable."
 }
 
 post_upgrade() {
-  /usr/lib/package-manager/init-nix.sh || echo ">>> ERROR: /usr/lib/package-manager/init-nix.sh not found or not executable."
+  /usr/lib/package-manager/nix/init.sh || echo ">>> ERROR: /usr/lib/package-manager/nix/init.sh not found or not executable."
 }
 
 post_remove() {

packaging/debian/postinst

@@ -3,7 +3,7 @@ set -e
 
 case "$1" in
     configure)
-        /usr/lib/package-manager/init-nix.sh || echo ">>> ERROR: /usr/lib/package-manager/init-nix.sh not found or not executable."
+        /usr/lib/package-manager/nix/init.sh || echo ">>> ERROR: /usr/lib/package-manager/nix/init.sh not found or not executable."
         ;;
 esac
 

packaging/debian/rules

@@ -32,8 +32,9 @@ override_dh_auto_install:
 		debian/package-manager/usr/bin/pkgmgr
 
 	# Install shared Nix init script
-	install -m0755 scripts/init-nix.sh \
-		debian/package-manager/usr/lib/package-manager/init-nix.sh
+	install -d debian/package-manager/usr/lib/package-manager/nix
+	install -m0755 scripts/nix/init.sh \
+		debian/package-manager/usr/lib/package-manager/nix/init.sh
 
 	# Copy full project source into /usr/lib/package-manager,
 	# but do not include the debian/ directory itself.

packaging/fedora/package-manager.spec

@@ -12,7 +12,7 @@ BuildArch:      noarch
 # NOTE:
 # Nix is a runtime requirement, but it is *not* declared here as a hard
 # RPM dependency, because many distributions do not ship a "nix" RPM.
-# Instead, Nix is installed and initialized by init-nix.sh, which is
+# Instead, Nix is installed and initialized by nix/init.sh, which is
 # called in the %post scriptlet below.
 
 %description
@@ -22,7 +22,7 @@ manager via a local Nix flake:
   nix run /usr/lib/package-manager#pkgmgr -- ...
 
 Nix is a runtime requirement and is installed/initialized by the
-init-nix.sh helper during package installation if it is not yet
+nix/init.sh helper during package installation if it is not yet
 available on the system.
 
 %prep
@@ -45,7 +45,8 @@ cp -a . %{buildroot}/usr/lib/package-manager/
 install -m0755 scripts/pkgmgr-wrapper.sh %{buildroot}%{_bindir}/pkgmgr
 
 # Shared Nix init script (ensure it is executable in the installed tree)
-install -m0755 scripts/init-nix.sh %{buildroot}/usr/lib/package-manager/init-nix.sh
+install -d %{buildroot}/usr/lib/package-manager/nix
+install -m0755 scripts/nix/init.sh %{buildroot}/usr/lib/package-manager/nix/init.sh
 
 # Remove packaging-only and development artefacts from the installed tree
 rm -rf \
@@ -60,7 +61,7 @@ rm -rf \
   %{buildroot}/usr/lib/package-manager/.gitkeep || true
 
 %post
-/usr/lib/package-manager/init-nix.sh || echo ">>> ERROR: /usr/lib/package-manager/init-nix.sh not found or not executable."
+/usr/lib/package-manager/nix/init.sh || echo ">>> ERROR: /usr/lib/package-manager/nix/init.sh not found or not executable."
 
 %postun
 echo ">>> package-manager removed. Nix itself was not removed."