fix: preserve streaming compaction auth errors

(cherry picked from commit 6fe25c6a08e169a15fca057a56e1ce36f46bc641)

packages/agent/src/compaction/compaction-v2-streaming.ts

@@ -21,6 +21,7 @@ import {
 	parseAzureDeploymentNameMap,
 	resolveOpenAIRequestSetup,
 } from "@oh-my-pi/pi-ai/providers/openai-shared";
+import { captureOpenAIHttpError } from "@oh-my-pi/pi-ai/utils/openai-http";
 import {
 	CODEX_BASE_URL,
 	getCodexAccountId,
@@ -334,18 +335,19 @@ async function attemptCompactionV2Streaming(
 	});
 
 	if (!response.ok) {
-		const errorText = await response.text().catch(() => "");
+		const cause = await captureOpenAIHttpError(response);
 		logger.warn("V2 remote compaction failed", {
 			endpoint,
 			status: response.status,
 			statusText: response.statusText,
-			errorText,
+			errorText: cause.captured.bodyText ?? "",
 		});
 		throw new ProviderHttpError(
 			`V2 remote compaction failed (${response.status} ${response.statusText})`,
 			response.status,
 			{
 				headers: response.headers,
+				cause,
 			},
 		);
 	}

packages/agent/test/remote-compaction.test.ts

@@ -20,6 +20,7 @@ import {
 	trimRemoteCompactionInputToContextWindow,
 } from "@oh-my-pi/pi-agent-core/compaction/openai";
 import * as ai from "@oh-my-pi/pi-ai";
+import * as AIError from "@oh-my-pi/pi-ai/error";
 import { getOpenAICodexTransportDetails } from "@oh-my-pi/pi-ai/providers/openai-codex-responses";
 import type {
 	AssistantMessage,
@@ -733,6 +734,36 @@ describe("requestCompactionV2Streaming", () => {
 
 		expect(attempts).toBe(2);
 	});
+
+	test("preserves auth_unavailable from V2 HTTP failures", async () => {
+		const model = makeOpenAiModel({
+			remoteCompaction: {
+				enabled: true,
+				v2StreamingEnabled: true,
+				v2Endpoint: "https://compact.example/v1/responses",
+			},
+		});
+		const request = buildCompactionV2Request(
+			model,
+			[{ type: "message", role: "user", content: [{ type: "input_text", text: "real user" }] }],
+			"instructions",
+		);
+		const fetchMock = vi.fn(async () =>
+			Response.json(
+				{ error: { type: "auth_unavailable", message: "no auth available for codex" } },
+				{ status: 503, statusText: "Service Unavailable" },
+			),
+		);
+
+		const error = await requestCompactionV2Streaming(model, "test-key", request, undefined, {
+			fetch: fetchMock,
+			retryWait: async () => {},
+		}).catch(cause => cause);
+
+		expect(fetchMock).toHaveBeenCalled();
+		expect(error).toBeInstanceOf(AIError.ProviderHttpError);
+		expect(AIError.is(AIError.classify(error), AIError.Flag.AuthFailed)).toBe(true);
+	});
 });
 
 describe("Responses Lite remote compaction", () => {