replace the old dotfiles with the sakura line rice

The bare $HOME repo is gone. This is now the rice: install.sh, rice-*
scripts in bin/, configs in home/ linked into $HOME, theme templates, st
and the particle wallpaper. Clone to ~/rice and run install.sh.

home/.config/rice/bash/git.bash

@@ -0,0 +1,24 @@
+# Sakura Line - git worktree helpers.
+
+# ga <branch>: new branch in its own worktree next to the repository
+# (../<repo>-<branch>), and cd into it.
+ga() {
+  local branch="${1:-}" top main dir
+  [[ -n $branch ]] || { echo "usage: ga <branch>"; return 1; }
+  top=$(git rev-parse --show-toplevel 2>/dev/null) || { echo "ga: not inside a git repository"; return 1; }
+  main=$(dirname "$(git -C "$top" rev-parse --path-format=absolute --git-common-dir)")
+  dir="$(dirname "$main")/$(basename "$main")-${branch//\//-}"
+  git -C "$top" worktree add -b "$branch" "$dir" && cd "$dir"
+}
+
+# gd: remove the current worktree and its branch (asks first; never the main one).
+gd() {
+  local top main branch answer
+  top=$(git rev-parse --show-toplevel 2>/dev/null) || { echo "gd: not inside a git repository"; return 1; }
+  main=$(git worktree list --porcelain | awk '/^worktree / { print $2; exit }')
+  [[ $top != "$main" ]] || { echo "gd: this is the main worktree; not removing it"; return 1; }
+  branch=$(git branch --show-current)
+  read -rp "Remove worktree $top and branch $branch? [y/N] " answer
+  [[ $answer == [yY]* ]] || return 1
+  cd "$main" && git worktree remove "$top" && git branch -D "$branch"
+}