Add setup keychain ssh agent

setup.sh

@@ -14,6 +14,20 @@ link() {
     ln -s "$2" "$1"
   fi
 }
+# Like link(), but backs up existing regular files instead of skipping them
+smartlink() {
+  local target="$1" source="$2"
+  echo "Linking $target to $source"
+  if [ -L "$target" ]; then
+    : # already a symlink, nothing to do
+  elif [ -e "$target" ]; then
+    mv "$target" "${target}.bak"
+    echo "  Backed up existing file to ${target}.bak"
+    ln -s "$source" "$target"
+  else
+    ln -s "$source" "$target"
+  fi
+}
 configlink() {
   link ~/.config/$1 ~/.dotfiles/$1
 }
@@ -33,3 +47,16 @@ configlink kanshi
 
 checkdir ~/.claude
 link ~/.claude/settings.json ~/.dotfiles/claude/settings.json
+
+# Fish shell config
+checkdir ~/.config/fish
+checkdir ~/.config/fish/conf.d
+smartlink ~/.config/fish/config.fish ~/.dotfiles/fish/config.fish
+link ~/.config/fish/conf.d/ssh-keychain.fish ~/.dotfiles/fish/conf.d/ssh-keychain.fish
+
+# Migrate BW_SESSION and other machine-specific fish vars to local.fish
+if [ -f ~/.config/fish/config.fish.bak ] && [ ! -f ~/.config/fish/local.fish ]; then
+  echo "  Migrating machine-specific config from config.fish.bak to local.fish"
+  grep -v '^#' ~/.config/fish/config.fish.bak | grep -v '^\s*$' > ~/.config/fish/local.fish
+  echo "  Review ~/.config/fish/local.fish and remove anything now handled by dotfiles"
+fi