docs(functions): standardize all function doc blocks to UNIX man-page style

Replace all ad-hoc inline comments between license headers and function
declarations with consistent SYNOPSIS / DESCRIPTION / ARGUMENTS / RETURNS /
EXAMPLE blocks across all 99 project-owned functions/ files. No executable
logic, variable names, or exit codes were modified.

Completes Task #6 from AGENTS.md (Retroactive Function Documentation
Standardization).

functions/ssh.fish

@@ -1,7 +1,19 @@
 # Copyright (C) 2026 Rootiest
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
-# Alias ssh to kitten ssh when using Kitty terminal
+# SYNOPSIS
+#   ssh [args...]
+#
+# DESCRIPTION
+#   Wraps ssh with kitten ssh inside Kitty terminal for better terminal
+#   integration (e.g. terminfo forwarding). Falls back to system ssh on
+#   other terminals.
+#
+# ARGUMENTS
+#   args...  Arguments forwarded to kitten ssh or system ssh
+#
+# EXAMPLE
+#   ssh user@host
 function ssh --description 'Alias ssh to kitten ssh when using Kitty terminal'
     if test "$TERM" = xterm-kitty
         kitten ssh $argv