add trajectory_id to TrajectoryStep

[snimu]

Description

Adds trajectory_id to TrajectoryStep, which is useful for training multi-agent systems. In those, there are several mostly independent, multi-turn rollouts. We want to interleave the trajectory steps for each of those rollouts for efficiency, but must keep the rollouts of the different agents separate. This PR adds a trajectory_id to enable the correct grouping and interleaving of rollouts for training.

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

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Note

Adds per-step trajectory_id to enable grouping/interleaving of trajectories and wires it through state and environments.

• Extend TrajectoryStep with trajectory_id: str
• Initialize state["trajectory_id"] = uuid4().hex in Environment.init_state
• Attach trajectory_id to steps in MultiTurnEnv.add_model_response and RLM sub-LLM steps (batch_id_request_id); preserve is_truncated
• Update tests to include trajectory_id in all TrajectoryStep constructions and adjust token fields; update docs to reflect new fields

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[willccbb]

Can this just be "trajectory_id" ?

[willccbb]

@cursoragent pls change "current_trajectory_id" to just "trajectory_id"

[cursor]

View PR

Good catch—I'll rename current_trajectory_id to trajectory_id and update all references.

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