chore: merge dev into v2

packages/core/test/plugin/models-dev.test.ts

@@ -244,7 +244,10 @@ describe("ModelsDevPlugin", () => {
             body: {},
           })
 
-          const anthropicEffortModel = yield* catalog.model.get(ProviderV2.ID.anthropic, ModelV2.ID.make("claude-effort"))
+          const anthropicEffortModel = yield* catalog.model.get(
+            ProviderV2.ID.anthropic,
+            ModelV2.ID.make("claude-effort"),
+          )
           expect(anthropicEffortModel?.variants).toContainEqual({
             id: ModelV2.VariantID.make("low"),
             settings: { thinking: { type: "adaptive", display: "summarized" }, effort: "low" },

packages/core/test/plugin/provider-github-copilot.test.ts

@@ -157,6 +157,42 @@ describe("GithubCopilotPlugin", () => {
     }),
   )
 
+  it.effect("uses advertised Copilot endpoint metadata before model ID fallbacks", () =>
+    Effect.gen(function* () {
+      const plugin = yield* PluginV2.Service
+      const aisdk = yield* AISDK.Service
+      const calls: string[] = []
+      yield* addPlugin()
+      yield* aisdk.runLanguage({
+        model: ModelV2.Info.make({
+          ...ModelV2.Info.empty(ProviderV2.ID.make("github-copilot"), ModelV2.ID.make("mai-code-1-flash-picker")),
+          api: {
+            id: ModelV2.ID.make("mai-code-1-flash-picker"),
+            type: "aisdk",
+            package: "test-provider",
+            settings: { endpoint: "responses" },
+          },
+        }),
+        sdk: fakeSelectorSdk(calls),
+        options: { endpoint: "responses" },
+      })
+      yield* aisdk.runLanguage({
+        model: ModelV2.Info.make({
+          ...ModelV2.Info.empty(ProviderV2.ID.make("github-copilot"), ModelV2.ID.make("gpt-5")),
+          api: {
+            id: ModelV2.ID.make("gpt-5"),
+            type: "aisdk",
+            package: "test-provider",
+            settings: { endpoint: "chat" },
+          },
+        }),
+        sdk: fakeSelectorSdk(calls),
+        options: { endpoint: "chat" },
+      })
+      expect(calls).toEqual(["responses:mai-code-1-flash-picker", "chat:gpt-5"])
+    }),
+  )
+
   it.effect("uses the API model ID when selecting responses or chat", () =>
     Effect.gen(function* () {
       const plugin = yield* PluginV2.Service