[codex] HTTP-first Codex upstream websocket settings (#280)

* http-first codex upstream websocket settings

* address websocket runtime review comments

---------

Co-authored-by: apple <apple@appledeMacBook-Pro.local>

src/server/proxy-core/surfaces/chatSurface.ts

@@ -264,6 +264,7 @@ export async function handleChatSurfaceRequest(
     };
     let startTime = Date.now();
     const leaseResult = await acquireSurfaceChannelLease({
+      stickySessionKey,
       selected,
     });
     if (leaseResult.status === 'timeout') {
@@ -789,6 +790,7 @@ export async function handleClaudeCountTokensSurfaceRequest(
     const oauth = getOauthInfoFromAccount(selected.account);
     const startTime = Date.now();
     const leaseResult = await acquireSurfaceChannelLease({
+      stickySessionKey,
       selected,
     });
     if (leaseResult.status === 'timeout') {

src/server/proxy-core/surfaces/openAiResponsesSurface.ts

@@ -380,6 +380,7 @@ export async function handleOpenAiResponsesSurfaceRequest(
 
 	      const startTime = Date.now();
 	      const leaseResult = await acquireSurfaceChannelLease({
+	        stickySessionKey,
 	        selected,
 	      });
 	      if (leaseResult.status === 'timeout') {

src/server/proxy-core/surfaces/sharedSurface.ts

@@ -187,13 +187,17 @@ export function clearSurfaceStickyChannel(input: {
 }
 
 export async function acquireSurfaceChannelLease(input: {
+  stickySessionKey?: string | null;
   selected: {
     channel: { id: number };
     account?: { extraConfig?: string | null } | null;
   };
 }) {
   return await proxyChannelCoordinator.acquireChannelLease({
-    channelId: input.selected.channel.id,
+    // Only session-addressable requests should consume the guarded per-channel
+    // lease pool. Requests without a stable downstream session key should keep
+    // the pre-sticky-session parallel behavior instead of contending globally.
+    channelId: input.stickySessionKey ? input.selected.channel.id : 0,
     accountExtraConfig: input.selected.account?.extraConfig,
   });
 }