fix: canonicalize opencode-go base URL

extensions/opencode-go/index.test.ts

@@ -1,4 +1,5 @@
-import { describe, it } from "vitest";
+import { describe, expect, it } from "vitest";
+import { registerSingleProviderPlugin } from "../../test/helpers/plugins/plugin-registration.js";
 import { expectPassthroughReplayPolicy } from "../../test/helpers/provider-replay-policy.ts";
 import plugin from "./index.js";
 
@@ -19,4 +20,63 @@ describe("opencode-go provider plugin", () => {
       modelId: "qwen3-coder",
     });
   });
+
+  it("canonicalizes stale OpenCode Go base URLs", async () => {
+    const provider = await registerSingleProviderPlugin(plugin);
+
+    expect(
+      provider.normalizeConfig?.({
+        provider: "opencode-go",
+        providerConfig: {
+          api: "openai-completions",
+          baseUrl: "https://opencode.ai/go/v1/",
+          models: [],
+        },
+      } as never),
+    ).toMatchObject({
+      baseUrl: "https://opencode.ai/zen/go/v1",
+    });
+
+    expect(
+      provider.normalizeResolvedModel?.({
+        provider: "opencode-go",
+        model: {
+          provider: "opencode-go",
+          id: "kimi-k2.5",
+          name: "Kimi K2.5",
+          api: "openai-completions",
+          baseUrl: "https://opencode.ai/go/v1",
+          reasoning: true,
+          input: ["text"],
+          cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+          contextWindow: 262_144,
+          maxTokens: 65_536,
+        },
+      } as never),
+    ).toMatchObject({
+      baseUrl: "https://opencode.ai/zen/go/v1",
+    });
+
+    expect(
+      provider.normalizeTransport?.({
+        provider: "opencode-go",
+        api: "openai-completions",
+        baseUrl: "https://opencode.ai/go/v1",
+      } as never),
+    ).toEqual({
+      api: "openai-completions",
+      baseUrl: "https://opencode.ai/zen/go/v1",
+    });
+
+    expect(
+      provider.normalizeTransport?.({
+        provider: "opencode-go",
+        api: "anthropic-messages",
+        baseUrl: "https://opencode.ai/go",
+      } as never),
+    ).toEqual({
+      api: "anthropic-messages",
+      baseUrl: "https://opencode.ai/zen/go",
+    });
+  });
 });