feat: preflight update runner before rebase

src/cli/update-cli.ts

@@ -68,8 +68,12 @@ const STEP_LABELS: Record<string, string> = {
   "clean check": "Working directory is clean",
   "upstream check": "Upstream branch exists",
   "git fetch": "Fetching latest changes",
-  "git rebase": "Rebasing onto upstream",
+  "git rebase": "Rebasing onto target commit",
+  "git rev-parse @{upstream}": "Resolving upstream commit",
+  "git rev-list": "Enumerating candidate commits",
   "git clone": "Cloning git checkout",
+  "preflight worktree": "Preparing preflight worktree",
+  "preflight cleanup": "Cleaning preflight worktree",
   "deps install": "Installing dependencies",
   build: "Building",
   "ui:build": "Building UI",