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/app-server/src/bespoke_event_handling.rs

@@ -2143,11 +2143,11 @@ mod tests {
     use codex_protocol::protocol::ItemStartedEvent;
     use codex_protocol::protocol::RateLimitSnapshot;
     use codex_protocol::protocol::RateLimitWindow;
-    use codex_protocol::protocol::RolloutItem;
     use codex_protocol::protocol::SessionSource;
     use codex_protocol::protocol::TokenUsage;
     use codex_protocol::protocol::TokenUsageInfo;
     use codex_protocol::protocol::UserMessageEvent;
+    use codex_rollout::RolloutItem;
     use codex_thread_store::StoredThread;
     use codex_thread_store::StoredThreadHistory;
     use codex_utils_absolute_path::AbsolutePathBuf;

codex-rs/app-server/src/external_agent_migration/session_importer.rs

@@ -30,9 +30,9 @@ use codex_protocol::models::BaseInstructions;
 use codex_protocol::models::BaseInstructionsProvenance;
 use codex_protocol::protocol::EventMsg;
 use codex_protocol::protocol::MultiAgentVersion;
-use codex_protocol::protocol::RolloutItem;
 use codex_protocol::protocol::ThreadHistoryMode;
 use codex_protocol::protocol::ThreadMemoryMode;
+use codex_rollout::RolloutItem;
 use codex_rollout::is_persisted_rollout_item;
 use codex_thread_store::AppendThreadItemsParams;
 use codex_thread_store::CreateThreadParams;

codex-rs/app-server/src/request_processors.rs

@@ -440,15 +440,12 @@ use codex_protocol::protocol::ConversationTextParams;
 use codex_protocol::protocol::EventMsg;
 #[cfg(test)]
 use codex_protocol::protocol::GitInfo as CoreGitInfo;
-use codex_protocol::protocol::InitialHistory;
 use codex_protocol::protocol::McpAuthStatus as CoreMcpAuthStatus;
 use codex_protocol::protocol::Op;
 use codex_protocol::protocol::RealtimeVoicesList;
-use codex_protocol::protocol::ResumedHistory;
 use codex_protocol::protocol::ReviewDelivery as CoreReviewDelivery;
 use codex_protocol::protocol::ReviewRequest;
 use codex_protocol::protocol::ReviewTarget as CoreReviewTarget;
-use codex_protocol::protocol::RolloutItem;
 use codex_protocol::protocol::SessionConfiguredEvent;
 #[cfg(test)]
 use codex_protocol::protocol::SessionMetaLine;
@@ -460,6 +457,9 @@ use codex_protocol::user_input::MAX_USER_INPUT_TEXT_CHARS;
 use codex_protocol::user_input::UserInput as CoreInputItem;
 use codex_rmcp_client::StreamableHttpRedirectMode;
 use codex_rmcp_client::perform_oauth_login_return_url;
+use codex_rollout::InitialHistory;
+use codex_rollout::ResumedHistory;
+use codex_rollout::RolloutItem;
 use codex_rollout::is_persisted_rollout_item;
 use codex_rollout::state_db::StateDbHandle;
 use codex_rollout::state_db::reconcile_rollout;

codex-rs/app-server/src/request_processors/feedback_processor.rs

@@ -432,8 +432,8 @@ fn windows_sandbox_log_attachment(_codex_home: &Path) -> Option<FeedbackAttachme
 #[cfg(test)]
 mod tests {
     use super::*;
-    use codex_protocol::protocol::RolloutLine;
     use codex_protocol::protocol::TurnContextItem;
+    use codex_rollout::RolloutLine;
     use pretty_assertions::assert_eq;
     #[test]
     fn feedback_tags_drop_unverified_client_prompt_tags() {

codex-rs/app-server/src/request_processors/thread_processor_tests.rs

@@ -45,12 +45,12 @@ mod persisted_resume_approval_policy_tests {
     use codex_protocol::models::PermissionProfile;
     use codex_protocol::protocol::AskForApproval;
     use codex_protocol::protocol::EventMsg;
-    use codex_protocol::protocol::RolloutItem;
     use codex_protocol::protocol::SandboxPolicy;
     use codex_protocol::protocol::ThreadSettingsAppliedEvent;
     use codex_protocol::protocol::ThreadSettingsSnapshot;
     use codex_protocol::protocol::TurnContextItem;
     use codex_protocol::protocol::TurnStartedEvent;
+    use codex_rollout::RolloutItem;
     use codex_utils_absolute_path::AbsolutePathBuf;
     use pretty_assertions::assert_eq;
 
@@ -1129,9 +1129,9 @@ mod thread_processor_behavior_tests {
 
     #[tokio::test]
     async fn read_summary_from_rollout_returns_empty_preview_when_no_user_message() -> Result<()> {
-        use codex_protocol::protocol::RolloutItem;
-        use codex_protocol::protocol::RolloutLine;
         use codex_protocol::protocol::SessionMetaLine;
+        use codex_rollout::RolloutItem;
+        use codex_rollout::RolloutLine;
         use std::fs;
         use std::fs::FileTimes;
 
@@ -1187,9 +1187,9 @@ mod thread_processor_behavior_tests {
 
     #[tokio::test]
     async fn read_summary_from_rollout_preserves_agent_nickname() -> Result<()> {
-        use codex_protocol::protocol::RolloutItem;
-        use codex_protocol::protocol::RolloutLine;
         use codex_protocol::protocol::SessionMetaLine;
+        use codex_rollout::RolloutItem;
+        use codex_rollout::RolloutLine;
         use std::fs;
 
         let temp_dir = TempDir::new()?;
@@ -1239,9 +1239,9 @@ mod thread_processor_behavior_tests {
 
     #[tokio::test]
     async fn read_summary_from_rollout_preserves_forked_from_id() -> Result<()> {
-        use codex_protocol::protocol::RolloutItem;
-        use codex_protocol::protocol::RolloutLine;
         use codex_protocol::protocol::SessionMetaLine;
+        use codex_rollout::RolloutItem;
+        use codex_rollout::RolloutLine;
         use std::fs;
 
         let temp_dir = TempDir::new()?;

codex-rs/app-server/src/request_processors/token_usage_replay.rs

@@ -20,7 +20,7 @@ use codex_app_server_protocol::TurnStatus;
 use codex_core::CodexThread;
 use codex_protocol::ThreadId;
 use codex_protocol::protocol::EventMsg;
-use codex_protocol::protocol::RolloutItem;
+use codex_rollout::RolloutItem;
 
 use crate::outgoing_message::ConnectionId;
 use crate::outgoing_message::OutgoingMessageSender;

codex-rs/app-server/src/thread_state.rs

@@ -17,7 +17,7 @@ use codex_protocol::items::AgentMessageContent as CoreAgentMessageContent;
 use codex_protocol::items::TurnItem as CoreTurnItem;
 use codex_protocol::models::MessagePhase;
 use codex_protocol::protocol::EventMsg;
-use codex_protocol::protocol::RolloutItem;
+use codex_rollout::RolloutItem;
 use codex_rollout::state_db::StateDbHandle;
 use codex_utils_path_uri::LegacyAppPathString;
 use std::collections::HashMap;