fix: change git clone --bare to git clone in create_worktree()

Issue #57: worktree creation was creating bare repos instead of
proper worktrees, breaking parallel agent workflow.

The --bare flag created repos with no working directory, making them
useless for development. Changed to regular clone.

skills/kugetsu/scripts/kugetsu

@@ -208,7 +208,7 @@ create_worktree() {
     fi
     
     echo "Creating worktree at '$worktree_path'..."
-    git clone --bare "$repo_url" "$worktree_path" 2>/dev/null || {
+    git clone "$repo_url" "$worktree_path" 2>/dev/null || {
         echo "Error: Failed to clone repository" >&2
         exit 1
     }