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, 30 insertions, 0 deletions

diff --git a/dotfiles/common/.zsh/modules/Test/README b/dotfiles/common/.zsh/modules/Test/README
new file mode 100644
index 0000000..d012277
--- /dev/null
+++ b/dotfiles/common/.zsh/modules/Test/README
@@ -0,0 +1,30 @@
+There are now different sections, expressed by the first letter in the
+scripts names:
+
+ A: basic command parsing and execution
+ B: builtins
+ C: shell commands with special syntax
+ D: substititution
+ E: options
+ V: modules
+ W: builtin interactive commands and constructs
+ X: line editing
+ Y: completion
+ Z: separate systems and user contributions
+
+You will need to run these by using `make test' in the Test subdirectory of
+the build area for your system (which may or may not be the same as the
+Test subdirectory of the source tree), or the directory above.  You can get
+more information about the tests being performed with
+  ZTST_verbose=1 make check
+(`test' is equivalent to `check') or change 1 to 2 for even more detail.
+
+Individual or groups of tests can be performed with
+  make TESTNUM=C02 check
+or
+  make TESTNUM=C check
+to perform just the test beginning C02, or all tests beginning C,
+respectively.
+
+Instructions on how to write tests are given in B01cd.ztst, which acts as a
+model.