init: add source code from src.zip

src/utils/worktreeModeEnabled.ts

@@ -0,0 +1,11 @@
+/**
+ * Worktree mode is now unconditionally enabled for all users.
+ *
+ * Previously gated by GrowthBook flag 'tengu_worktree_mode', but the
+ * CACHED_MAY_BE_STALE pattern returns the default (false) on first launch
+ * before the cache is populated, silently swallowing --worktree.
+ * See https://github.com/anthropics/claude-code/issues/27044.
+ */
+export function isWorktreeModeEnabled(): boolean {
+  return true
+}