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, 25 insertions, 0 deletions

diff --git a/dotfiles/common/.zsh/modules/Test/B06fc.ztst b/dotfiles/common/.zsh/modules/Test/B06fc.ztst
new file mode 100644
index 0000000..922b001
--- /dev/null
+++ b/dotfiles/common/.zsh/modules/Test/B06fc.ztst
@@ -0,0 +1,25 @@
+# Tests of fc command
+%prep
+
+ mkdir fc.tmp 
+ cd fc.tmp
+ print 'fc -l foo' >fcl
+ 
+%test
+  $ZTST_testdir/../Src/zsh -f ./fcl
+1:Checking that fc -l foo doesn't core dump when history is empty
+?./fcl:fc:1: event not found: foo
+
+  PS1='%% ' $ZTST_testdir/../Src/zsh +Z -fsi <<< $'fc -p /dev/null 0 0\n:'
+0:Checking that fc -p doesn't core dump when history size is zero
+*?*%*
+
+  PS1='%% ' $ZTST_testdir/../Src/zsh +Z -fsi <<< 'fc -p /dev/null a 0'
+1:Checking that fc -p rejects non-integer history size
+*?*% fc: HISTSIZE must be an integer
+*?*%*
+
+  PS1='%% ' $ZTST_testdir/../Src/zsh +Z -fsi <<< 'fc -p /dev/null 0 a'
+1:Checking that fc -p rejects non-integer history save size
+*?*% fc: SAVEHIST must be an integer
+*?*%*