Repo skeleton, pinned environment, free smoke test

Public from commit one, so no key ever enters this history.

compose.yaml is ImpossibleBench's, plus working_dir: /workspace. The image has no
WORKDIR, so inspect resolves it to "/" and the task files land at the filesystem root
among twenty-odd entries. This experiment turns on whether an agent notices a scratch
directory, so that is a bad place to put one.

ImpossibleBench installs with --no-deps to keep the swebench tree out; datasets is
declared here instead because hf_dataset genuinely needs it.

Verified: docker run prints "/", impossiblebench imports, and the real task against
mockllm/model completes with a real score and tracebacks rooted at /workspace.

Claude-Session: https://claude.ai/code/session_01Cq98H7sNoSJdL3W98f18bu

justfile

@@ -0,0 +1,22 @@
+# All recipes run from the repo root, because inspect resolves compose.yaml against the
+# process working directory. See docs/setup.md.
+
+impossiblebench := "../impossiblebench"
+
+# Sync dependencies, then re-add ImpossibleBench (uv sync prunes it).
+install:
+    uv sync
+    uv pip install -e {{impossiblebench}} --no-deps
+
+# Offline unit tests. No network, no provider beyond mockllm.
+test:
+    uv run pytest -q
+
+# The real task against a fake model. Free.
+smoke:
+    uv run python scripts/smoke_mock.py
+
+# Confirms the daemon is up and pre-pulls the image so the first eval does not
+# time out on a cold pull. Should print "/".
+docker-check:
+    docker run --rm aisiuk/inspect-tool-support pwd