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, 29 insertions, 0 deletions

diff --git a/dotfiles/common/.zsh/modules/Test/V08zpty.ztst b/dotfiles/common/.zsh/modules/Test/V08zpty.ztst
new file mode 100644
index 0000000..b0cbfa0
--- /dev/null
+++ b/dotfiles/common/.zsh/modules/Test/V08zpty.ztst
@@ -0,0 +1,29 @@
+# zpty is required by tests of interactive modes of the shell itself.
+# This tests some extra things.
+
+%prep
+
+  if ! zmodload zsh/zpty 2>/dev/null
+  then
+    ZTST_unimplemented="the zsh/zpty module is not available"
+  elif [[ $OSTYPE = cygwin ]]; then
+    ZTST_unimplemented="the zsh/zpty module does not work on Cygwin"
+  fi
+
+%test
+
+  zpty cat cat
+  zpty -w cat a line of text
+  var=
+  zpty -r cat var && print -r -- ${var%%$'\r\n'}
+  zpty -d cat
+0:zpty with a process that does not set up the terminal: internal write
+>a line of text
+
+  zpty cat cat
+  print a line of text | zpty -w cat
+  var=
+  zpty -r cat var && print -r -- ${var%%$'\r\n'}
+  zpty -d cat
+0:zpty with a process that does not set up the terminal: write via stdin
+>a line of text