Add Terminal-Bench adapter (terminal-bench-core==0.1.1)

[Ylr9933]

Terminal-Bench (laude-institute/terminal-bench) is the docker-per-task resolution benchmark. Adds it as a Benchmark adapter in experiments/benchmark/terminal_bench/, following alfworld's shape.

Version lock — terminal-bench-core==0.1.1 (registry.json published entry):
commit 91e10457b5410f16c44364da1a34cb6de8c488a5
branch dataset/terminal-bench-core/v0.1.x
task_id_subset 80 ids (.base/.easy/.hard variants) -> 70 unique task dirs
(repo has no git tags; PyPI terminal-bench-core 404; 0.1.1 is the latest registerable release. main HEAD drifts and is not reproducible, so not used.)

Adapter surface:

• tasks(): 70 curated dirs; SUBSET_BASES embedded as a module tuple (clone-only source, no dataset-side file). Sampling rewoo_draw(seed).
• on_task(): builds + runs the per-task container (base image ghcr.io/laude-institute/t-bench/python-3-13, multi-arch); mounts run-tests.sh + tests/ into /app:ro; the lone exec tool docker-exec's in.
• score(): runs the official run-tests.sh (which runs uv run pytest tests/) in the agent-modified container end-state; correctness = pytest pass (the dataset's own judge, not a reimplementation).
• downloads(): pins the codeload tarball @ 91e10457 with the registry note.
• Registered in run.py BENCHMARK_FACTORIES; DOWNLOADS.md regenerated to cover it.
• .gitignore: ignore .venv/.

Gates:

• python -m experiments.scripts.datasets --write ok
• python -m experiments.scripts.check: 16 benches · 10 arms · 0 runs, all pass
• docker smoke on this arm64 mac: base image builds natively in 27s (no emulation); exec + mounted run-tests path works; end-to-end react × DeepSeek 1 task finishes through official pytest judging.

Known limits:

• ~10 heavy tasks (qemu kernel / hf-model / pytorch-model-cli ...) may not build on arm64 mac; recorded as env_unavailable. ~60/70 run here; all 70 should run on x86 linux.
• per-task ~4-7 min (apt/uv install pytest inside score can't be cached); 70 tasks ≈ 3-6 h.
• .easy/.hard variants not split; each unique dir runs once.

What this changes

How you know it works

Checklist

• npm run check passes
• npm run typecheck passes
• npm test passes
• npm run demo runs to completion
• I ran the code in this PR myself
• Every claim above has a command behind it
• No new dependencies — or, if there are, the PR says why the rule in CONTRIBUTING.md does not apply here