# Counterfactual Intervention Lattice Format

A CIL record is one action intervention from a shared initial state. Records that share
`group_id` form one lattice.

Required fields:

- `schema_version`
- `group_id`
- `state`
- `observation0`
- `instruction`
- `goal`
- `action`
- `next_observation`
- `reward`
- `structured_effect`
- `failure_type`
- `explanation`
- `metadata`

JSONL shards should preserve complete groups. A group may exceed the target shard size, but it
should never be split across shards unless an explicit future streaming mode opts into that tradeoff.