Merge origin/master (v0.5.81) into gitea/new_feature

Resolve conflicts:
- streamingHandler.js: merge buildStreamErrorBytes onAbortTerminal + local shouldPersistRequestDetail & streamStatusForContent
- capabilities.js: preserve server-injected user-asserted caps and models.dev catalog lookup; wire CommandCode /alpha/generate caps inside resolve()
- commandcode.js (services/usage): adopt upstream whoami + billing credits/subscriptions with 5h/weekly rate windows and plan caps
- openai-to-commandcode.js: merge toNativeImageBlock (data-URI & http(s) support) and assistant reasoning_content preservation
- commandcode-to-openai.js: adopt upstream mid-stream error throw for clean retry and abortion
- tests: sync commandcode test suite and exclude .next from vitest config

open-sse/translator/response/commandcode-to-openai.js

@@ -183,27 +183,12 @@ export function commandCodeToOpenAIResponse(chunk, state) {
 			break;
 		}
 		case "error": {
-			// Terminal upstream failure (AI SDK v5 error event) — NOT content. Emit an
-			// OpenAI-shaped error chunk (chunk.error) so downstream — parseSSEToOpenAIResponse
-			// for non-streaming, OpenAI SDK clients for streaming — treats the request as
-			// failed instead of surfacing fake success content like "[CommandCode error: ...]".
-			state.finishReason = OPENAI_FINISH.STOP;
 			const errVal = event.error ?? event.message ?? "unknown";
 			const errStr =
-				typeof errVal === "string"
-					? errVal
-					: typeof errVal?.message === "string"
-						? errVal.message
-						: JSON.stringify(errVal);
-			const errType =
-				typeof errVal === "string"
-					? "upstream_error"
-					: errVal?.type || "upstream_error";
-			const errChunk = makeChunk(state, {});
-			errChunk.error = { message: errStr, type: errType };
-			out.push(errChunk);
-			out.push(makeChunk(state, {}, OPENAI_FINISH.STOP));
-			break;
+				typeof errVal === "string" ? errVal : JSON.stringify(errVal);
+			// Mid-stream error: throw rather than emitting as fake content with finish_reason: "stop"
+			// This ensures the downstream stream handler marks the stream as errored/aborted.
+			throw new Error(`[CommandCode error: ${errStr}]`);
 		}
 		// Silently ignore: start, start-step, reasoning-start, reasoning-end, text-start, text-end,
 		// provider-metadata, message-metadata, etc. They carry no client-visible content.