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.

build-image.sh

@@ -105,9 +105,7 @@ apt-get install -y \
     less \
     rsync \
     git \
-    squashfs-tools \
-    wget \
-    curl
+    squashfs-tools
 
 # Clean up
 apt-get clean