Extract persisted history types into a dedicated crate (#37871)

## What changed

- Add `codex-history` for model-history and persisted-rollout domain types, including `RolloutItem`, `RolloutLine`, `CompactedItem`, and initial/resumed history state.
- Re-export the persisted types from `codex-rollout` and update consumers to use the new crate boundary instead of `codex-protocol`.
- Preserve existing rollout serialization, including legacy numeric compacted-window IDs.

## Testing

- Add `codex-history` tests for rollout JSON round trips, compacted-history compatibility, persisted history modes, and multi-agent version selection.

GitOrigin-RevId: 944daa9297ddd231d3aebbdcb05fff4adf8b4e1b

codex-rs/rollout/Cargo.toml

@@ -18,6 +18,7 @@ chrono = { workspace = true, features = ["serde"] }
 codex-extension-items = { workspace = true }
 codex-file-search = { workspace = true }
 codex-git-utils = { workspace = true }
+codex-history = { workspace = true }
 codex-otel = { workspace = true }
 codex-protocol = { workspace = true }
 codex-state = { workspace = true }