feat(help): header-driven --help for system-info functions

gip, gip4, gip6, ports, swapstat, sbver and steam-dl. All ignored $argv,
so --help previously ran the query or the launcher. sbver keeps its own
--brief flag: only argv[1] is inspected and --brief is not a help flag,
so the body still runs for it.

functions/gip.fish

@@ -14,6 +14,8 @@
 # EXAMPLE
 #   gip
 function gip --description 'Show all public IP addresses'
+    __fish_help_header (status current-function) $argv; and return 0
+
     echo -n "IPv4: "
     curl -4 -s --max-time 2 https://icanhazip.com || echo "Not detected"
     echo -n "IPv6: "

functions/gip4.fish

@@ -13,5 +13,7 @@
 # EXAMPLE
 #   gip4
 function gip4 --wraps='curl' --description 'Get public IPv4 address'
+    __fish_help_header (status current-function) $argv; and return 0
+
     curl -4 -s https://icanhazip.com
 end

functions/gip6.fish

@@ -21,6 +21,8 @@
 # EXAMPLE
 #   gip6
 function gip6 --description 'Get public IPv6 address'
+    __fish_help_header (status current-function) $argv; and return 0
+
     # Use -6 to force IPv6 and --fail to catch network errors
     set -l ip (curl -6 -s --fail https://icanhazip.com 2>/dev/null)
     

functions/ports.fish

@@ -14,5 +14,7 @@
 # EXAMPLE
 #   ports
 function ports --wraps='sudo' --description 'Show active network listeners'
+    __fish_help_header (status current-function) $argv; and return 0
+
     sudo lsof -iTCP -sTCP:LISTEN -P -n
 end

functions/sbver.fish

@@ -24,6 +24,8 @@
 #   sbver
 #   sbver --brief
 function sbver --description 'Verifies Secure Boot status of EFI binaries using sbctl'
+  __fish_help_header (status current-function) $argv; and return 0
+
   if not type -q sbctl
     echo "Error: 'sbctl' is not installed."
     return 1

functions/steam-dl.fish

@@ -14,6 +14,8 @@
 # EXAMPLE
 #   steam-dl
 function steam-dl --description 'Run Steam while inhibiting system sleep'
+    __fish_help_header (status current-function) $argv; and return 0
+
     echo "Inhibiting sleep while Steam downloads..."
     systemd-inhibit --why="Active Download" --who="User" --what=idle:sleep steam
 end

functions/swapstat.fish

@@ -15,6 +15,8 @@
 # EXAMPLE
 #   swapstat
 function swapstat --description 'View colorized zRAM and swappiness status'
+    __fish_help_header (status current-function) $argv; and return 0
+
     set -l swappiness (sysctl -n vm.swappiness)
     set -l zdata (zramctl --bytes --noheadings --output DATA,TOTAL /dev/zram0 2>/dev/null)