Remove direct prime-sandboxes dependency from rlm-swe v1

[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

High Risk
High risk because it replaces the rlm_swe_v1 taskset implementation with dataset-driven, sandbox-backed test staging/execution and adds new sandbox file-transfer/background-job APIs that affect runtime interactions.

Overview
Reworks rlm_swe_v1 to remove Harbor/packaged tasks and instead build tasks from the R2E-Gym/R2E-Gym-Subset dataset, including per-row sandbox image selection, environment variable construction, optional repo filtering, and reward based on running run_tests.sh and parsing pytest summaries.

Adds rollout setup/cleanup hooks to stage hidden tests by archiving/downloading them out of the sandbox and later re-uploading them for scoring; removes the bundled skills/ and tasks/ smoke content and updates packaging/dependencies accordingly.

Expands several v1 example environments to at least 10 examples (more task rows + higher num_examples in pyprojects), refactors some static task sources to be generated from shared lists, and adds new tests to enforce the 10-example minimum and to cover the new rlm_swe_v1 behavior.

Extends verifiers.v1 sandbox helpers (SandboxLease/SandboxHandle) with upload_file, download_file, and run_background_job methods to support the new SWE workflow.

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