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Adds the `nested_containers` bottle flag. On the macOS backend it starts a rootless podman service inside the bottle and exposes its Docker-compatible API socket, so the agent still runs `docker` and `docker compose`. No host daemon socket is mounted and the guest gains no capabilities; backends that cannot run a guest-local engine reject the flag in the shared prepare template rather than ignoring it. Podman rather than rootless Docker because Apple Container's capability bounding set omits CAP_SYS_ADMIN, which the kernel requires to write a multi-range uid_map via newuidmap. With no subordinate UID range podman falls back to a single-UID self-mapping an unprivileged process may write itself, so the image build strips /etc/subuid and /etc/subgid entries rather than adding them. That mapping is also why nested containers are not an isolation layer: root inside one is the agent user outside it. They are a build/test convenience; the bottle remains the boundary. Ports the spike branch onto main, renaming docker_access — it implied Docker and granted access to nothing on the host — and drops podman from the derived layer now that every built-in image ships it (#451). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Docs
How this project records what it builds and why — and a guide to picking the right document for what you're capturing.
When to write which document
| Artifact | For |
|---|---|
PRD (docs/prds/) |
A feature: what to build, scope, success criteria. |
Research note (docs/research/) |
A landscape/tradeoff investigation. |
Decision record (docs/decisions/) |
A decision that isn't itself a feature — a policy, a convention, a "we will / won't do this," or a load-bearing choice made inside a larger PRD that deserves to be discoverable on its own. |
A decision that's fully specified by a PRD doesn't need duplicating in a decision record. Write one when the decision would otherwise be buried in prose, lost in an issue thread, or have no in-repo home at all (small requests that don't merit a PRD; non-feature choices like merge strategy or a trust posture).