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/view.fish

@@ -1,7 +1,18 @@
 # Copyright (C) 2026 Rootiest
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
-# alias view=nvim -R
+# SYNOPSIS
+#   view [args...]
+#
+# DESCRIPTION
+#   Opens files in nvim read-only mode (-R). Falls back to less if nvim
+#   is not installed.
+#
+# ARGUMENTS
+#   args...  Files or options forwarded to nvim -R or less
+#
+# EXAMPLE
+#   view /etc/fstab
 function view --wraps='nvim -R' --description 'alias view=nvim -R'
     if type -q nvim
         nvim -R $argv