feat: default new Codex agents to the qualified Paperclip Runner

Resolve creation intent across onboarding, hires, imports, and the UI. Preserve existing execution and qualify automatic defaults for shipped Linux x64 artifacts.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/services/native-runtime/runtime-mode.test.ts

@@ -43,10 +43,18 @@ describe("resolveNativeRuntimeMode", () => {
     }
   });
 
-  it("rejects a fresh Paperclip Runner start while the rollout flag is disabled", () => {
+  it("admits fresh native Codex when the experimental rollout is disabled", () => {
+    expect(resolveNativeRuntimeMode({
+      ...eligible,
+      enabled: false,
+    })).toMatchObject({ kind: "native", profile: { backend: "codex_app_server" } });
+  });
+
+  it("still rejects experimental providers while the rollout flag is disabled", () => {
     expect(() => resolveNativeRuntimeMode({
       ...eligible,
       enabled: false,
+      adapterConfig: { provider: "opencode", model: "openrouter/deepseek/deepseek-v4-flash-0731" },
     })).toThrow(expect.objectContaining({
       code: "paperclip_runner_rollout_disabled",
     }));
@@ -187,14 +195,17 @@ describe("resolveNativeRuntimeMode", () => {
     }));
   });
 
-  it("keeps a persisted active run native while the global flag rejects a fresh runner start", () => {
-    const disabled = { ...eligible, enabled: false };
+  it("keeps a persisted experimental run native while the flag rejects a fresh start", () => {
+    const disabled = { ...eligible, enabled: false,
+      adapterConfig: { provider: "opencode", model: "openrouter/deepseek/deepseek-v4-flash-0731" },
+    };
     expect(resolveHeartbeatNativeRuntimeMode({
       ...disabled,
       persisted: {
         runtimeMode: "native",
         runtimeModeReason: "eligible_opt_in",
         runtimeModeResolvedAt: new Date(),
+        driverKind: "opencode_server",
       },
     })).toEqual(expect.objectContaining({
       kind: "native",
@@ -458,6 +469,7 @@ describe("resolveHeartbeatRuntimeMode compatibility", () => {
       ...compatibilityInput,
       enabled: false,
       adapterType: "paperclip_runner",
+      adapterConfig: { provider: "opencode", model: "opencode/gpt-5" },
     })).toThrow(NativeRunnerSelectionError);
   });
 });