Conversation naming (#8991)

Session renaming:
- `/rename my_session`
- `/rename` without arg and passing an argument in `customViewPrompt`
- AppExitInfo shows resume hint using the session name if set instead of
uuid, defaults to uuid if not set
- Names are stored in `CODEX_HOME/sessions.jsonl`

Session resuming:
- codex resume <name> lookup for `CODEX_HOME/sessions.jsonl` first entry
matching the name and resumes the session

---------

Co-authored-by: jif-oai <jif@openai.com>

codex-rs/mcp-server/src/codex_tool_runner.rs

@@ -308,6 +308,9 @@ async fn run_codex_tool_session_inner(
                     EventMsg::SessionConfigured(_) => {
                         tracing::error!("unexpected SessionConfigured event");
                     }
+                    EventMsg::ThreadNameUpdated(_) => {
+                        // Ignore session metadata updates in MCP tool runner.
+                    }
                     EventMsg::AgentMessageDelta(_) => {
                         // TODO: think how we want to support this in the MCP
                     }

codex-rs/mcp-server/src/outgoing_message.rs

@@ -258,6 +258,7 @@ mod tests {
             msg: EventMsg::SessionConfigured(SessionConfiguredEvent {
                 session_id: thread_id,
                 forked_from_id: None,
+                thread_name: None,
                 model: "gpt-4o".to_string(),
                 model_provider_id: "test-provider".to_string(),
                 approval_policy: AskForApproval::Never,
@@ -298,6 +299,7 @@ mod tests {
         let session_configured_event = SessionConfiguredEvent {
             session_id: conversation_id,
             forked_from_id: None,
+            thread_name: None,
             model: "gpt-4o".to_string(),
             model_provider_id: "test-provider".to_string(),
             approval_policy: AskForApproval::Never,
@@ -362,6 +364,7 @@ mod tests {
         let session_configured_event = SessionConfiguredEvent {
             session_id: thread_id,
             forked_from_id: None,
+            thread_name: None,
             model: "gpt-4o".to_string(),
             model_provider_id: "test-provider".to_string(),
             approval_policy: AskForApproval::Never,