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/history/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+edition.workspace = true
+license.workspace = true
+name = "codex-history"
+version.workspace = true
+
+[lib]
+doctest = false
+name = "codex_history"
+path = "src/lib.rs"
+
+[lints]
+workspace = true
+
+[dependencies]
+codex-protocol = { workspace = true }
+schemars = { workspace = true }
+serde = { workspace = true, features = ["derive"] }
+
+[dev-dependencies]
+anyhow = { workspace = true }
+pretty_assertions = { workspace = true }
+serde_json = { workspace = true }