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, 80 insertions, 0 deletions

diff --git a/dotfiles/common/.zsh/modules/Test/A03quoting.ztst b/dotfiles/common/.zsh/modules/Test/A03quoting.ztst
new file mode 100644
index 0000000..da3ce35
--- /dev/null
+++ b/dotfiles/common/.zsh/modules/Test/A03quoting.ztst
@@ -0,0 +1,80 @@
+%test
+  print 'single  quotes'  "double  quotes"  `echo backquotes`
+0:Simple use of quotes
+>single  quotes double  quotes backquotes
+
+  foo=text
+  print -r '$foo\\\' "$foo\$foo\\\"\``echo bar`\`\"" `print -r $foo\\\``
+0:Quoting inside quotes
+>$foo\\\ text$foo\"`bar`" text`
+
+  print -r $'\'ut queant laxis\'\n"resonare fibris"'
+0:$'-style quotes
+>'ut queant laxis'
+>"resonare fibris"
+
+  print -r $'\'a \\\' is \'a backslash\' is \'a \\\''
+0:$'-style quotes with backslashed backslashes
+>'a \' is 'a backslash' is 'a \'
+
+  chars=$(print -r $'BS\\MBS\M-\\')
+  for (( i = 1; i <= $#chars; i++ )); do
+    char=$chars[$i]
+    print $(( [#16] #char ))
+  done
+0:$'-style quote with metafied backslash
+>16#42
+>16#53
+>16#5C
+>16#4D
+>16#42
+>16#53
+>16#DC
+
+  print -r ''''
+  setopt rcquotes
+# We need to set rcquotes here for the next example since it is
+# needed while parsing.
+0:No RC_QUOTES with single quotes
+>
+
+  print -r ''''
+  unsetopt rcquotes
+0:Yes RC_QUOTES with single quotes
+>'
+# ' Deconfuse Emacs quoting rules
+
+  print '<\u0041>'
+  printf '%s\n' $'<\u0042>'
+  print '<\u0043>'
+  printf '%s\n' $'<\u0044>'
+0:\u in both print and printf
+><A>
+><B>
+><C>
+><D>
+
+  null1="$(print -r a$'b\0c'd)"
+  null2="$(setopt posixstrings; print -r a$'b\0c'd)"
+  for string in $null1 $null2; do
+    print ":"
+    for (( i = 1; i <= $#string; i++ )); do
+      char=$string[$i]
+      print $(( [#16] #char ))
+    done
+  done
+0:Embedded null characters in $'...' strings.
+>:
+>16#61
+>16#62
+>16#0
+>16#63
+>16#64
+>:
+>16#61
+>16#62
+>16#64
+
+ () { print $# } '' "" $''
+0:$'' should not be elided, in common with other empty quotes
+>3