feat(agents): add tool-free isolated completion (#114343)

* feat: add isolated pure-inference completion

* fix(google): block ambient system prompt writes

* docs: refresh generated map

extensions/clickclack/src/inbound.test.ts

@@ -67,6 +67,10 @@ function createRuntime(): PluginRuntime {
         model: "gpt-5.4-mini",
         agentId: "service-bot",
         usage: {},
+        execution: {
+          mode: "direct-provider",
+          owner: { kind: "provider", id: "openai" },
+        },
         audit: {
           caller: { kind: "plugin", id: "clickclack" },
         },
@@ -291,6 +295,10 @@ describe("handleClickClackInbound", () => {
       model: "gpt-5.4-mini",
       agentId: "service-bot",
       usage: {},
+      execution: {
+        mode: "direct-provider",
+        owner: { kind: "provider", id: "openai" },
+      },
       audit: { caller: { kind: "plugin", id: "clickclack" } },
     });
     setClickClackRuntime(runtime);