[derekmeegan]

Moves the Python SDK contract tests from browserbase/browserbase-stlc-config#39 into this repo's CI, for the one-repo flow.

• tests/lib/test_downloads.py covers downloads pagination, metadata, deletion, errors, the legacy ZIP endpoint, streaming without eager reads, stream_to_file(), and cancellation, both sync and async.
• tests/lib/test_sdk_exports.py covers the public exports.
• tests/lib/sdk_types.py is the type-level contract. pytest doesn't collect it, and ./scripts/lint checks it with pyright.

This is stacked on feat/downloads, the preview build of browserbase/browserbase-stlc-config#75. Retarget it to main after #75 merges. Nothing in it edits generated files, and the preview's own CI already passes.

The tests now use this repo's pytest settings instead of unittest: pytest classes, parametrize in place of subTest, and tmp_path, with every assertion kept. To pass strict pyright, sdk_types.py gained an __all__ for names imported only to prove they exist, and three reads of the not-required project_id carry a rule-specific pyright: ignore. mypy . excludes tests/, so in CI pyright is what checks the type file; running mypy on these files directly also passes.

Locally, ./scripts/lint passes. pytest tests/lib passes 29 tests on Python 3.9 (pydantic v2 and v1) and 3.14. The full ./scripts/test also passes with the mock server.

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