feat: unify gateway heartbeat

src/agents/model-selection.test.ts

@@ -19,7 +19,7 @@ describe("resolveConfiguredModelRef", () => {
     expect(resolved).toEqual({ provider: "openai", model: "gpt-4.1-mini" });
   });
 
-  it("falls back to default provider when agent.model omits it", () => {
+  it("falls back to anthropic when agent.model omits provider", () => {
     const cfg = {
       agent: { model: "claude-opus-4-5" },
     } satisfies ClawdisConfig;
@@ -30,10 +30,7 @@ describe("resolveConfiguredModelRef", () => {
       defaultModel: DEFAULT_MODEL,
     });
 
-    expect(resolved).toEqual({
-      provider: DEFAULT_PROVIDER,
-      model: "claude-opus-4-5",
-    });
+    expect(resolved).toEqual({ provider: "anthropic", model: "claude-opus-4-5" });
   });
 
   it("falls back to defaults when agent.model is missing", () => {

src/agents/model-selection.ts

@@ -39,7 +39,7 @@ export function resolveConfiguredModelRef(params: {
       if (parsed) return parsed;
     }
     // TODO(steipete): drop this fallback once provider-less agent.model is fully deprecated.
-    return { provider: params.defaultProvider, model: trimmed };
+    return { provider: "anthropic", model: trimmed };
   }
   return { provider: params.defaultProvider, model: params.defaultModel };
 }