test: align planner explain output with execution

test/scripts/test-parallel.test.ts

@@ -248,6 +248,18 @@ describe("scripts/test-parallel lane planning", () => {
     ).toThrowError(/Unsupported test profile "macmini"/u);
   });
 
+  it("rejects unknown explicit surface names", () => {
+    const repoRoot = path.resolve(import.meta.dirname, "../..");
+
+    expect(() =>
+      execFileSync("node", ["scripts/test-parallel.mjs", "--plan", "--surface", "channel"], {
+        cwd: repoRoot,
+        env: process.env,
+        encoding: "utf8",
+      }),
+    ).toThrowError(/Unsupported --surface value\(s\): channel/u);
+  });
+
   it("rejects wrapper --files values that look like options", () => {
     const repoRoot = path.resolve(import.meta.dirname, "../..");
 

test/scripts/test-planner.test.ts

@@ -110,4 +110,21 @@ describe("test planner", () => {
     expect(explanation.reasons).toContain("base-pinned-manifest");
     expect(explanation.intentProfile).toBe("normal");
   });
+
+  it("uses hotspot-backed memory isolation when explaining unit tests", () => {
+    const explanation = explainExecutionTarget(
+      {
+        mode: "local",
+        fileFilters: ["src/infra/outbound/targets.channel-resolution.test.ts"],
+      },
+      {
+        env: {
+          OPENCLAW_TEST_LOAD_AWARE: "0",
+        },
+      },
+    );
+
+    expect(explanation.isolate).toBe(true);
+    expect(explanation.reasons).toContain("unit-memory-isolated");
+  });
 });