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Addresses the third review round on PR #481. - `bot-bottle doctor` now checks `is_backend_ready()` (a full backend status() probe: daemon reachable, network pool present, KVM usable) instead of the cheap PATH-only `is_backend_available()`. A host with a stopped Docker daemon or half-configured Firecracker no longer reports `ok: backend` / exit 0 when `start` can't actually work; each not-ready backend prints its own diagnostics, and doctor passes only if at least one backend is ready. - `install.sh` resolves the pip `--user` scripts directory from the interpreter (`sysconfig.get_path("scripts", get_preferred_scheme("user"))`) instead of hardcoding `~/.local/bin`, which is wrong on a python.org macOS interpreter (`~/Library/Python/<X.Y>/bin`). The PATH guidance now prints the actual directory. Tests: doctor tests mock `is_backend_ready` (the readiness contract) and cover the not-ready → fail path; a new install-script test drives the macOS `osx_framework_user` scheme and asserts it resolves a non-~/.local/bin directory. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>