feat: show forked from session id in /status (#9330)

Summary:
- Add forked_from to SessionMeta/SessionConfiguredEvent and persist it
for forked sessions.
- Surface forked_from in /status for tui + tui2 and add snapshots.

codex-rs/core/src/rollout/recorder.rs

@@ -57,6 +57,7 @@ pub struct RolloutRecorder {
 pub enum RolloutRecorderParams {
     Create {
         conversation_id: ThreadId,
+        forked_from_id: Option<ThreadId>,
         instructions: Option<String>,
         source: SessionSource,
     },
@@ -79,11 +80,13 @@ enum RolloutCmd {
 impl RolloutRecorderParams {
     pub fn new(
         conversation_id: ThreadId,
+        forked_from_id: Option<ThreadId>,
         instructions: Option<String>,
         source: SessionSource,
     ) -> Self {
         Self::Create {
             conversation_id,
+            forked_from_id,
             instructions,
             source,
         }
@@ -158,6 +161,7 @@ impl RolloutRecorder {
         let (file, rollout_path, meta) = match params {
             RolloutRecorderParams::Create {
                 conversation_id,
+                forked_from_id,
                 instructions,
                 source,
             } => {
@@ -181,6 +185,7 @@ impl RolloutRecorder {
                     path,
                     Some(SessionMeta {
                         id: session_id,
+                        forked_from_id,
                         timestamp,
                         cwd: config.cwd.clone(),
                         originator: originator().value,

codex-rs/core/src/rollout/tests.rs

@@ -641,6 +641,7 @@ async fn test_updated_at_uses_file_mtime() -> Result<()> {
         item: RolloutItem::SessionMeta(SessionMetaLine {
             meta: SessionMeta {
                 id: conversation_id,
+                forked_from_id: None,
                 timestamp: ts.to_string(),
                 instructions: None,
                 cwd: ".".into(),