refactor(shell): reorganize shell config for proper separation

Restructure shell configuration to follow standard conventions:
- .profile: Environment variables only (POSIX compatible)
- .bash_profile: NEW - sources .profile and .bashrc for login shells
- .bashrc: Bash-specific settings, sources .bashrc.d/
- .zshrc: Zsh-specific settings, sources .zshrc.d/

New modular directories:
- .bashrc.d/: aliases, emacs, fzf, git, media, utilities
- .zshrc.d/: same as bashrc.d plus arch-downgrade (zsh-only)
- .profile.d/: reduced to env-only files (display, framework, auto-tmux)

Fixes:
- Remove duplicate .profile sourcing in .bashrc
- Remove broken XDG_CURRENT_DESKTOP=GNOME line from display.sh
- Move aliases/functions from .profile to appropriate .d/ directories
- Shell-specific init (zoxide, fzf) now in .bashrc/.zshrc directly
- FreeBSD bindkey fix now in .zshrc directly

Also adds CLAUDE.md session context file.

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

1 files changed, 47 insertions, 0 deletions

diff --git a/dotfiles/system/.zshrc.d/arch-downgrade.sh b/dotfiles/system/.zshrc.d/arch-downgrade.sh
new file mode 100644
index 0000000..f1d01a7
--- /dev/null
+++ b/dotfiles/system/.zshrc.d/arch-downgrade.sh
@@ -0,0 +1,47 @@
+# arch-downgrade.sh
+# Craig Jennings <c@cjennings.net>
+# Downgrade Arch packages with fzf (zsh only)
+
+# Config:
+#   export DG_HELPER=pacman   # or yay, paru, etc.
+#   export DG_FZF_OPTS="..."  # optional extra fzf flags
+
+dg() {
+    emulate -L zsh
+    set -u
+    set -o pipefail
+
+    local helper="${DG_HELPER:-pacman}"
+
+    # Check dependencies
+    for cmd in "$helper" fzf sudo downgrade awk sort; do
+        if ! command -v "${cmd%% *}" >/dev/null 2>&1; then
+            print -u2 -- "Missing dependency: $cmd"
+            return 1
+        fi
+    done
+
+    # List explicitly installed packages
+    local selection
+    selection="$(
+        "$helper" -Qe 2>/dev/null \
+          | fzf --no-multi \
+                --prompt="Pick package to downgrade > " \
+                --height=80% \
+                --reverse \
+                --delimiter=' ' \
+                --preview-window=right:60%:wrap \
+                --preview "$helper -Qi {1} 2>/dev/null || $helper -Si {1}" \
+                ${DG_FZF_OPTS:-}
+    )"
+
+    [[ $? -ne 0 || -z "$selection" ]] && return 0
+
+    local pkg
+    pkg="$(print -r -- "$selection" | head -n1 | awk '{print $1}')"
+
+    if ! sudo downgrade "$pkg"; then
+        print -u2 -- "Downgrade failed for $pkg"
+        return 1
+    fi
+}