Add a benchmark

WorldEvals indexes benchmark repos; it doesn't host them. A benchmark is any repository that:

1. depends on Inspect Robots,
2. defines one or more Inspect Robots Tasks, and
3. registers them via entry points: [project.entry-points."inspect_robots.tasks"] (and, if it ships a simulator/embodiment or policy, inspect_robots.embodiments / inspect_robots.policies).

See StationeryBench as the reference implementation.

List it in the catalog

Add a Benchmark(...) entry to src/worldevals/catalog.py and open a PR:

Benchmark(
    name="stationerybench",
    title="StationeryBench",
    description="5 bimanual desk-stationery tasks, one fixed setup each: ...",
    repo="https://github.com/robocurve/stationerybench",
    install='pip install "stationerybench @ git+https://github.com/robocurve/stationerybench"',  # PyPI name once published
    task_keys=("stationerybench/uncap_marker", ...),  # the Inspect Robots task keys it registers
    tags=("stationery", "bimanual", "manipulation"),
    bimanual=True,
    contributors=("your-handle",),
    status="alpha",
)

The homepage card grid is generated from this catalog at build time, so adding an entry updates the site automatically. A test validates every entry (unique name, well-formed https://github.com/... repo URL, ≥1 task key), and CI requires 100% coverage. Keep task_keys in sync with the benchmark's actual registered task names.

Every public module, class, and function needs a docstring, enforced by ruff D1; state the contract, don't restate the name.

See the API reference for the Benchmark fields.