feat: add phase 1 mem client (#10629)

Adding a client on top of https://github.com/openai/openai/pull/672176

codex-rs/codex-api/src/common.rs

@@ -6,6 +6,7 @@ use codex_protocol::openai_models::ReasoningEffort as ReasoningEffortConfig;
 use codex_protocol::protocol::RateLimitSnapshot;
 use codex_protocol::protocol::TokenUsage;
 use futures::Stream;
+use serde::Deserialize;
 use serde::Serialize;
 use serde_json::Value;
 use std::pin::Pin;
@@ -37,6 +38,33 @@ pub struct CompactionInput<'a> {
     pub instructions: &'a str,
 }
 
+/// Canonical input payload for the memory trace summarize endpoint.
+#[derive(Debug, Clone, Serialize)]
+pub struct MemoryTraceSummarizeInput {
+    pub model: String,
+    pub traces: Vec<MemoryTrace>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub reasoning: Option<Reasoning>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct MemoryTrace {
+    pub id: String,
+    pub metadata: MemoryTraceMetadata,
+    pub items: Vec<Value>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct MemoryTraceMetadata {
+    pub source_path: String,
+}
+
+#[derive(Debug, Clone, Deserialize, PartialEq, Eq)]
+pub struct MemoryTraceSummaryOutput {
+    pub trace_summary: String,
+    pub memory_summary: String,
+}
+
 #[derive(Debug)]
 pub enum ResponseEvent {
     Created,