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/core/src/session/mod.rs

@@ -65,6 +65,7 @@ use codex_extension_api::TurnContextContributionInput;
 use codex_features::FEATURES;
 use codex_features::Feature;
 use codex_features::unstable_features_warning_event;
+use codex_history::RolloutItem;
 use codex_hooks::Hooks;
 use codex_hooks::HooksConfig;
 use codex_login::AuthManager;
@@ -120,7 +121,6 @@ use codex_protocol::protocol::ItemStartedEvent;
 use codex_protocol::protocol::MULTI_AGENT_MODE_OPEN_TAG;
 use codex_protocol::protocol::MultiAgentVersion;
 use codex_protocol::protocol::RawResponseItemEvent;
-use codex_protocol::protocol::RolloutItem;
 use codex_protocol::protocol::SessionSource;
 use codex_protocol::protocol::SubAgentSource;
 use codex_protocol::protocol::ThreadHistoryMode;
@@ -336,6 +336,8 @@ use codex_core_plugins::PluginCommandAttribution;
 use codex_core_plugins::PluginsManager;
 use codex_core_plugins::RecommendedPluginCandidatesInput;
 use codex_git_utils::get_git_repo_root;
+use codex_history::CompactedItem;
+use codex_history::InitialHistory;
 use codex_mcp::McpConfig;
 use codex_mcp::effective_mcp_servers;
 use codex_otel::SessionTelemetry;
@@ -354,13 +356,11 @@ use codex_protocol::openai_models::ReasoningEffort as ReasoningEffortConfig;
 use codex_protocol::protocol::ApplyPatchApprovalRequestEvent;
 use codex_protocol::protocol::AskForApproval;
 use codex_protocol::protocol::CodexErrorInfo;
-use codex_protocol::protocol::CompactedItem;
 use codex_protocol::protocol::DeprecationNoticeEvent;
 use codex_protocol::protocol::ErrorEvent;
 use codex_protocol::protocol::Event;
 use codex_protocol::protocol::EventMsg;
 use codex_protocol::protocol::ExecApprovalRequestEvent;
-use codex_protocol::protocol::InitialHistory;
 use codex_protocol::protocol::ModelRerouteEvent;
 use codex_protocol::protocol::ModelRerouteReason;
 use codex_protocol::protocol::ModelVerification;