FastAPI app, upstream Confluence/model adapters, authoritative history,
rootless container lifecycle, artifact storage and downloads, fake peers
under backend/dev, tests under tests/backend. Root pytest.ini deselects
the live marker by default; requirements gain the backend dependencies.
Pinned pi SDK 0.85.1 bridge, Python supervisor, artifact exporter,
scripted backend peer, image checks and boundary checks under agent/**.
Review findings F1-F3 are recorded in docs/implementation/PI_AGENT_REVIEW.md.
