A vendored clone of bench arrives carrying bench's own task cards, plans
and reference documents, so a new user's first board opened pre-loaded
with our backlog. install.py now detects first boot — a vendored install
(project root != manager root) whose manager/local/ has never been
populated (no .env, no state/) — and only then clears the stage
directories, tasks/archive/, plans/ and reference/, keeping
task-template.md and the .gitkeep files and printing every removal.
--dry-run lists instead of removing. After cleaning it stamps
manager/local/state/, so the guard is permanently false on every later
run even if the adapter wire fails, and a host's own cards are never
touched. Self-hosted repos (bench itself, including fresh dev clones)
are never cleaned: their tasks/ is the repo's history.
Covered end-to-end in tests/test_install_first_boot.py by running
install.py as a subprocess against scratch host layouts; README notes
the first-boot behaviour under "Install into a repo".
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
