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/mcp-server/tests/suite/list_resume.rs

@@ -157,7 +157,7 @@ fn create_fake_rollout(codex_home: &Path, filename_ts: &str, meta_rfc3339: &str,
     let file_path = dir.join(format!("rollout-{filename_ts}-{uuid}.jsonl"));
     let mut lines = Vec::new();
     // Meta line with timestamp
-    lines.push(json!({"timestamp": meta_rfc3339}).to_string());
+    lines.push(json!({"timestamp": meta_rfc3339, "id": uuid}).to_string());
     // Minimal user message entry as a persisted response item
     lines.push(
         json!({