Will/misc ty

[willccbb]

Description

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Test improvement

Testing

• All existing tests pass when running uv run pytest locally.
• New tests have been added to cover the changes

Checklist

• My code follows the style guidelines of this project as outlined in AGENTS.md
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Additional Notes

---

Note

Medium Risk
Mostly CI/docs and type-safety cleanup, but it changes runtime behavior in experimental envs by adding stricter validation and new failure modes if interception or dataset shapes are unexpected.

Overview
Updates CI/dev tooling to target Python 3.13: test.yml now runs on 3.12/3.13 (dropping 3.11), and the pre-push ty hook is forced to run under 3.13; docs are updated accordingly.

Tightens correctness in a few runtime paths: CliAgentEnv now centralizes a _require_interception_server() guard instead of relying on ty ignores, OpenCodeQAEnv.construct_dataset() validates load_dataset/map return types and column presence (and coerces non-string questions), and test_rollout_gateway_env adjusts mocking to patch get_background_job on the existing sandbox_client rather than replacing it. .gitignore also adds packages/harnesses and packages/tasksets.

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