Add utility tools and rescue guide documentation

Packages added:
- iotop: disk I/O monitor by process
- ncdu: interactive disk usage analyzer
- tree: directory tree viewer
- speedtest-cli: internet speed test
- mosh: mobile shell (survives disconnects)
- aria2: multi-protocol downloader with resume
- tmate: terminal sharing for remote assistance
- sshuttle: VPN over SSH
- pass: password manager

Rescue guide expanded:
- Section 5: iotop for finding disk I/O culprits
- Section 6: ncdu and tree for disk space analysis
- Section 7: speedtest-cli, mosh, aria2, tmate, sshuttle
- Section 8: pass password manager access

1 files changed, 11 insertions, 0 deletions

diff --git a/build.sh b/build.sh
index 8073423..3354094 100755
--- a/build.sh
+++ b/build.sh
@@ -164,6 +164,7 @@ lshw
 dmidecode
 nvme-cli
 hdparm
+iotop
 
 # Disk operations
 partclone
@@ -174,6 +175,8 @@ xfsprogs
 btrfs-progs
 f2fs-tools
 exfatprogs
+ncdu
+tree
 
 # Network diagnostics
 mtr
@@ -185,6 +188,14 @@ tcpdump
 bind
 nmap
 wireshark-cli
+speedtest-cli
+mosh
+aria2
+tmate
+sshuttle
+
+# Security
+pass
 
 EOF