fix(gym): prefetch missing Super35 service environments

[yfw]

Summary

Add the bundled SA-V tracks, citation instruction-following, conversational tool-use simulation, and structured-output v4 configs to the Super35 Gym prefetch config. Together they cover five previously missing service venvs:

• resources_servers/sav_tracks
• resources_servers/citation_if
• resources_servers/conversational_tool_use_simulation
• responses_api_agents/conversational_tool_use/simulation
• responses_api_agents/non_executing_simple_agent

Without these entries, newer multimodal/MOPD recipes install the environments during job startup, which can contend on editable Gym builds and time out. Including them lets image builds pre-install the dependencies instead. Existing prefetch entries, dependency pins, and training configs are unchanged.

Add parametrized regression coverage that checks each service has a bundled entrypoint and that its source exists in the pinned Gym checkout.

Validation

• Targeted prefetch tests: 15 passed, 3 skipped (existing local-vLLM checks require vLLM).
• Confirmed all five new regression cases fail against the previous prefetch config.
• Full Gym offline config resolution passes, including simulator_model inheritance and the nested simulation-agent venv path.
• Ruff checks/formatting and git diff --check pass.
• A full container rebuild was not run for this PR.

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