Generate more typescript types and return conversation id with ConversationSummary (#3219)

This PR does multiple things that are necessary for conversation resume
to work from the extension. I wanted to make sure everything worked so
these changes wound up in one PR:
1. Generate more ts types
2. Resume rollout history files rather than create a new one every time
it is resumed so you don't see a duplicate conversation in history for
every resume. Chatted with @aibrahim-oai to verify this
3. Return conversation_id in conversation summaries
4. [Cleanup] Use serde and strong types for a lot of the rollout file
parsing

codex-rs/protocol/src/mcp_protocol.rs

@@ -19,7 +19,7 @@ use strum_macros::Display;
 use ts_rs::TS;
 use uuid::Uuid;
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, TS, Hash, Default)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, TS, Hash)]
 #[ts(type = "string")]
 pub struct ConversationId(pub Uuid);
 
@@ -29,6 +29,12 @@ impl ConversationId {
     }
 }
 
+impl Default for ConversationId {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Display for ConversationId {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "{}", self.0)
@@ -199,7 +205,7 @@ pub struct NewConversationResponse {
     pub model: String,
 }
 
-#[derive(Serialize, Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize, Debug, Clone, TS)]
 #[serde(rename_all = "camelCase")]
 pub struct ResumeConversationResponse {
     pub conversation_id: ConversationId,
@@ -222,6 +228,7 @@ pub struct ListConversationsParams {
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, TS)]
 #[serde(rename_all = "camelCase")]
 pub struct ConversationSummary {
+    pub conversation_id: ConversationId,
     pub path: PathBuf,
     pub preview: String,
     /// RFC3339 timestamp string for the session start, if available.
@@ -631,4 +638,10 @@ mod tests {
             serde_json::to_value(&request).unwrap(),
         );
     }
+
+    #[test]
+    fn test_conversation_id_default_is_not_zeroes() {
+        let id = ConversationId::default();
+        assert_ne!(id.0, Uuid::nil());
+    }
 }