fix(provider-runtime): retry transient socket failures (#122535)

* test: cover UND_ERR_SOCKET retry recovery

Punchcard-Session: golden-cedar-brook-4q

* fix(provider-runtime): retry UND_ERR_SOCKET failures

Punchcard-Session: golden-cedar-brook-4q

src/agents/run-wait.test.ts

@@ -838,6 +838,7 @@ describe("isRecoverableAgentWaitError", () => {
     "EHOSTUNREACH",
     "ENETUNREACH",
     "EAI_AGAIN",
+    "UND_ERR_SOCKET",
   ])("recovers from %s connection failures", (code) => {
     expect(isRecoverableAgentWaitError(`connect ${code} 127.0.0.1:443`)).toBe(true);
   });

src/infra/retryable-network-errors.ts

@@ -55,7 +55,7 @@ const TRANSIENT_NETWORK_MESSAGE_SNIPPETS = [
 ];
 
 const RETRYABLE_CONNECTION_ERROR_CODE_RE =
-  /\b(?:ECONNRESET|ECONNREFUSED|ETIMEDOUT|EPIPE|EHOSTUNREACH|ENETUNREACH|EAI_AGAIN)\b/i;
+  /\b(?:ECONNRESET|ECONNREFUSED|ETIMEDOUT|EPIPE|EHOSTUNREACH|ENETUNREACH|EAI_AGAIN|UND_ERR_SOCKET)\b/i;
 
 function isWrappedFetchFailedMessage(message: string): boolean {
   if (message === "fetch failed") {

src/provider-runtime/operation-retry.test.ts

@@ -51,6 +51,7 @@ describe("executeProviderOperationWithRetry", () => {
     "EHOSTUNREACH",
     "ENETUNREACH",
     "EAI_AGAIN",
+    "UND_ERR_SOCKET",
     "ENOTFOUND",
   ])("retries %s network failures from structured errors", async (code) => {
     const cause = Object.assign(new Error("connect failed"), { code });