test(server): align specs with run environment and step schema

- update scenario tests to create runs with required environmentId
- adjust browser controller expectations to session auto-create behavior
- sync playwright/context mocks with current browser service usage

server/test/scenario-step-output.spec.ts

@@ -15,6 +15,7 @@ import { DataSource } from "typeorm";
 import { buildTestApp } from "./app.harness";
 import { ScenarioService } from "../src/scenario/scenario.service";
 import { ScenarioSchedulerService } from "../src/scenario/scenario-scheduler.service";
+import { EnvironmentEntity } from "../src/environment/environment.entity";
 
 describe("ScenarioRunStepEntity.output + helpers.getStepOutput", () => {
   let app: INestApplication;
@@ -52,18 +53,26 @@ describe("ScenarioRunStepEntity.output + helpers.getStepOutput", () => {
     scenarioId: string,
     _order: number,
     execCode: string,
-    sessionName = "output-test-session",
   ): Promise<string> {
     const step = await scenarioService.createStep(scenarioId, {
-      sessionName,
       execCode,
     });
     return step.id;
   }
 
+  /** Create a test environment and return its id. */
+  async function createEnvironment(
+    name = `output-env-${Math.random().toString(36).slice(2, 8)}`,
+  ): Promise<string> {
+    const repo = dataSource.getRepository(EnvironmentEntity);
+    const env = await repo.save(repo.create({ name, data: {} }));
+    return env.id;
+  }
+
   /** Trigger a run and process it to completion via the scheduler. */
   async function runScenario(scenarioId: string): Promise<string> {
-    const run = await scenarioService.createRun(scenarioId);
+    const environmentId = await createEnvironment();
+    const run = await scenarioService.createRun(scenarioId, environmentId);
     // Drive the scheduler directly — keeps tests synchronous and fast.
     await scheduler.pickUpPendingRuns();
     // Wait for the run to reach a terminal state (max 10 s).