fix(x): clear remaining tsc drift in runtime test fixtures

Same class as the two review findings — type errors only tsc sees
(tests run untyped under vitest; the build tsconfig excludes them):

- headless.test.ts read .agent.overrides without narrowing the
  RequestedAgent union; the assertions now compare the whole agent
  object, which is also stricter
- real-agent-resolver.test.ts's byte-identity fixture predates the
  videoMode/coachMode flags (explicit false = the schema defaults,
  so the composed bytes are unchanged)
- real-tool-registry.test.ts's permission asks predate isRead being
  required (options: [] was from the older ask shape)

npx tsc --noEmit -p tsconfig.json is now clean for the whole package.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/x/packages/core/src/runtime/assembly/headless.test.ts

@@ -252,7 +252,7 @@ describe("HeadlessAgentRunner", () => {
         const { runner, resolve } = createRunner(runtime);
         await runner.start({ agentId: "worker", message: "go" });
         expect(resolve).not.toHaveBeenCalled();
-        expect(runtime.createInputs[0].agent.overrides).toBeUndefined();
+        expect(runtime.createInputs[0].agent).toEqual({ agentId: "worker" });
     });
 
     it("uses an injected default only for a partial model override", async () => {
@@ -264,8 +264,9 @@ describe("HeadlessAgentRunner", () => {
             model: "custom-model",
         });
         expect(resolve).toHaveBeenCalledOnce();
-        expect(runtime.createInputs[0].agent.overrides).toEqual({
-            model: { provider: "default-provider", model: "custom-model" },
+        expect(runtime.createInputs[0].agent).toEqual({
+            agentId: "worker",
+            overrides: { model: { provider: "default-provider", model: "custom-model" } },
         });
     });
 

apps/x/packages/core/src/runtime/turns/bridges/real-agent-resolver.test.ts

@@ -163,6 +163,8 @@ describe("RealAgentResolver", () => {
                 searchEnabled: true,
                 codeMode: "claude",
                 codeCwd: null,
+                videoMode: false,
+                coachMode: false,
             }),
         );
     });

apps/x/packages/core/src/runtime/turns/bridges/real-tool-registry.test.ts

@@ -153,11 +153,11 @@ describe("RealToolRegistry", () => {
         const chunk = { type: "message", role: "agent", text: "hi" } as const;
         const resolution = {
             type: "permission",
-            ask: { toolCallId: "x", title: "write file", options: [] },
+            ask: { toolCallId: "x", title: "write file", isRead: false },
             decision: "allow_once",
             auto: false,
         } as const;
-        const ask = { toolCallId: "x", title: "write file", options: [] };
+        const ask = { toolCallId: "x", title: "write file", isRead: false };
         const { registry } = makeRegistry(async ({ ctx }) => {
             // Chatty stream events are ephemeral (CodeRunFeed) — NOT progress.
             await ctx.publish({