refactor(dotfiles): rename system/ to common/ and remove unused configs

Rename dotfiles/system to dotfiles/common for clarity - indicates
shared dotfiles used across all desktop environments (DWM, Hyprland).

Removed config directories for uninstalled applications:
- ghostty (using different terminal)
- lf (using ranger instead)
- mopidy (using mpd instead)
- nitrogen (X11-only, obsolete for Wayland)
- pychess (not installed)
- JetBrains (not installed via archsetup)
- youtube-dl (using yt-dlp with different config location)

Kept audacious config for potential future use.

Updated all references in archsetup, CLAUDE.md, todo.org, and
validation.sh.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 0 insertions, 169 deletions

diff --git a/dotfiles/system/.zsh/modules/Test/D08cmdsubst.ztst b/dotfiles/system/.zsh/modules/Test/D08cmdsubst.ztst
deleted file mode 100644
index 3625373..0000000
--- a/dotfiles/system/.zsh/modules/Test/D08cmdsubst.ztst
+++ /dev/null
@@ -1,169 +0,0 @@
-# Tests for command substitution.
-
-%prep
-  mkdir cmdsubst.tmp
-  touch cmdsubst.tmp/file{1,2}.txt
-
-%test
-  foo="two words"
-  print -l `echo $foo bar`
-0:Basic `...` substitution
->two
->words
->bar
-
-  foo="two words"
-  print -l $(echo $foo bar)
-0:Basic $(...) substitution
->two
->words
->bar
-
-  foo='intricate buffoonery'
-  print -l "`echo $foo and licentiousness`"
-0:Quoted `...` substitution
->intricate buffoonery and licentiousness
-
-  foo="more words"
-  print -l "$(echo $foo here)"
-0:Quoted $(...) substitution
->more words here
-
-# we used never to get this one right, but I think it is now...
-  print -r "`print -r \\\\\\\\`"
-0:Stripping of backslasshes in quoted `...`
->\\
-
-  print -r "$(print -r \\\\\\\\)"
-0:Stripping of backslashes in quoted $(...)
->\\\\
-
-  fnify() { print \"$*\"; }
-  print `fnify \`fnify understatement\``
-0:Nested `...`
->""understatement""
-
-  print $(fnify $(fnify overboard))
-0:Nested $(...)
->""overboard""
-
-  fructify() { print \'$*\'; }
-  print "`fructify \`fructify indolence\``"
-0:Nested quoted `...`
->''indolence''
-
-  print "$(fructify $(fructify obtuseness))"
-0:Nested quoted $(...)
->''obtuseness''
-
-  gesticulate() { print \!$*\!; }
-  print $((gesticulate wildly); gesticulate calmly)
-0:$(( ... ) ... ) is not arithmetic
->!wildly! !calmly!
-
-  commencify() { print +$*+; }
-  print "$((commencify output); commencify input)"
-0:quoted $(( ... ) .. ) is not arithmetic
->+output+
->+input+
-
-  (
-  cd cmdsubst.tmp
-  print first: ${$(print \*)}
-  print second: ${~$(print \*)}
-  print third: ${$(print *)}
-  print fourth: "${~$(print \*)}"
-  print fifth: ${~"$(print \*)"}
-  )
-0:mixing $(...) with parameter substitution and globbing
->first: *
->second: file1.txt file2.txt
->third: file1.txt file2.txt
->fourth: *
->fifth: file1.txt file2.txt
-
-  $(exit 0) $(exit 3) || print $?
-0:empty command uses exit value of last substitution
->3
-
-  X=$(exit 2) $(exit 0) || print $?
-0:variable assignments processed after other substitutions
->2
-
- false
- ``
-0:Empty command substitution resets status
-
- false
- echo `echo $?`
-0:Non-empty command substitution inherits status
->1
-
- echo $(( ##\" ))
- echo $(echo \")
- echo $((echo \"); echo OK)
-0:Handling of backslash double quote in parenthesised substitutions
->34
->"
->" OK
-
- echo $(case foo in
- foo)
- echo This test worked.
- ;;
- bar)
- echo This test failed in a rather bizarre way.
- ;;
- *)
- echo This test failed.
- ;;
- esac)
-0:Parsing of command substitution with unmatched parentheses: case, basic
->This test worked.
-
- echo "$(case bar in
- foo)
- echo This test spoobed.
- ;;
- bar)
- echo This test plurbled.
- ;;
- *)
- echo This test bzonked.
- ;;
- esac)"
-0:Parsing of command substitution with unmatched parentheses: case with quotes
->This test plurbled.
-
- echo before $(
- echo start; echo unpretentious |
- while read line; do
-   case $line in
-   u*)
-   print Word began with u
-   print and ended with a crunch
-   ;;
-   esac
- done | sed -e 's/Word/Universe/'; echo end
- ) after
-0:Parsing of command substitution with ummatched parentheses: with frills
->before start Universe began with u and ended with a crunch end after
-
-  alias foo='echo $('
-  eval 'foo echo this just works, OK\?)'
-0:backtracking within command string parsing with alias still pending
->this just works, OK?
-
-  (
-    set errexit
-    show_nargs() { print $#; }
-    print a $() b
-    print c "$()" d
-  )
-0:Empty $() is a valid empty substitution.
->a b
->c  d
-
-  empty=$() && print "'$empty'"
-0:Empty $() is a valid assignment
->''