Fix PAL review findings: documentation accuracy and code quality

- Update CLAUDE.md with complete kernel parameters including boot=netboot
- Remove duplicate wget/curl package declarations in build-image.sh
- Check unsquashfs in both /usr/bin and /usr/sbin in verify-image.sh
- Use consistent $quiet variable expansion in netboot hook functions

All issues identified in zen-opus pre-commit review are now resolved.

verify-image.sh

@@ -127,7 +127,7 @@ else
 fi
 
 # Check required binaries
-for binary in wget curl unsquashfs awk; do
+for binary in wget curl awk; do
     if [ -f "$TMPDIR/initramfs/main/usr/bin/$binary" ]; then
         success "$binary binary present"
     else
@@ -135,6 +135,13 @@ for binary in wget curl unsquashfs awk; do
     fi
 done
 
+# Check unsquashfs in both possible locations
+if [ -f "$TMPDIR/initramfs/main/usr/bin/unsquashfs" ] || [ -f "$TMPDIR/initramfs/main/usr/sbin/unsquashfs" ]; then
+    success "unsquashfs binary present"
+else
+    error "unsquashfs binary missing from initramfs"
+fi
+
 if [ -f "$TMPDIR/initramfs/main/usr/sbin/switch_root" ]; then
     success "switch_root binary present"
 else