fix(codex): fence concurrent quota updates

crates/aether-contracts/src/frame.rs

@@ -2,7 +2,10 @@ use std::collections::BTreeMap;
 
 use serde::{Deserialize, Serialize};
 
-use crate::{ExecutionError, ExecutionStreamTerminalSummary, ExecutionTelemetry};
+use crate::{
+    ExecutionError, ExecutionResponseObservation, ExecutionStreamTerminalSummary,
+    ExecutionTelemetry,
+};
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
 #[serde(rename_all = "snake_case")]
@@ -21,6 +24,8 @@ pub enum StreamFramePayload {
         status_code: u16,
         #[serde(default)]
         headers: BTreeMap<String, String>,
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        response_observation: Option<ExecutionResponseObservation>,
     },
     Data {
         #[serde(default, skip_serializing_if = "Option::is_none")]

crates/aether-contracts/src/lib.rs

@@ -19,7 +19,7 @@ pub use plan::{
     TRANSPORT_HTTP_MODE_H2C_PRIOR_KNOWLEDGE, TRANSPORT_HTTP_MODE_HTTP1_ONLY,
     TRANSPORT_POOL_SCOPE_KEY,
 };
-pub use result::{ExecutionResult, ExecutionTelemetry, ResponseBody};
+pub use result::{ExecutionResponseObservation, ExecutionResult, ExecutionTelemetry, ResponseBody};
 pub use usage::{
     ExecutionStreamTerminalSummary, StandardizedUsage, USAGE_SERVER_NOW_UNIX_MS_HEADER,
 };

crates/aether-contracts/src/result.rs

@@ -5,6 +5,13 @@ use serde_json::Value;
 
 use crate::ExecutionError;
 
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+pub struct ExecutionResponseObservation {
+    pub request_started_at_unix_ms: u64,
+    pub response_headers_observed_at_unix_ms: u64,
+    pub request_order_id: String,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
 pub struct ExecutionTelemetry {
     #[serde(default, skip_serializing_if = "Option::is_none")]
@@ -32,6 +39,8 @@ pub struct ExecutionResult {
     #[serde(default)]
     pub headers: BTreeMap<String, String>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub response_observation: Option<ExecutionResponseObservation>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
     pub body: Option<ResponseBody>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub telemetry: Option<ExecutionTelemetry>,