- Repo mode adopts a directory as-is via /lanes/ensure (no worktree, no
branch fields) - the right choice for a main repo you want stage
detection on. Worktree mode (default) keeps the existing provisioning
flow but now requires a manually-typed branch name instead of deriving
one from the title.
- POST /lanes/worktree accepts an optional `branch`, validated via
`git check-ref-format --branch`; omitting it preserves the CLI's
existing auto-derived-branch behavior.
- New GET /lanes/browse lists a directory's immediate subdirectories,
backing a small folder-browse modal on both path fields - browsers
cannot expose an absolute path from a native picker, so this is
server-backed instead, consistent with the tool's local-first model.
