Opening a folder that isn't a Git repository adds it as a project (Cmd+O / **Open folder…**). After that, every **New channel** in that project fails with `Could not start channel: <path> is not inside a Git repository`, which comes from `apps/host/src/manage.ts`. [Terms](https://github.com/githubnext/ace2/blob/main/docs/terms.md) define a project as "one or more repositories or local folders", so the picker offers a project where channels can't be created.

**Observed while validating #157:** - Setup: an isolated source host and a headless browser driving the real app. - `fixtures/folder-only` (a plain folder) opened as a project. - **New channel** failed with the error above. The error toast is visible in screenshot `05-picker` and is recorded in the host's `gateway.failed` log entry. - After `git init` and a first commit, the same folder created channels normally.

## Acceptance

Pick one and make the app consistent with it: - start channels in a non-Git folder (no lanes, or lanes disabled with a clear reason), or - explain at open time that the folder needs Git, before it appears as a project where channels can't be created.

Either way, update the terms and architecture docs if the meaning of "project" changes.

Dogfooding: #5.