refactor(scenario): remove validateCode — assertions live in execCode

- drop validateCode column, DTOs, service mappings, and scheduler branch
- remove parseValidateResult helper and ValidateResult interface
- inject playwright expect into code executor for direct use in execCode
- strip validateCode from MCP tool schemas, client types, and UI forms

server/src/scenario/scenario-scheduler.service.ts

@@ -17,11 +17,6 @@ import { ScenarioService } from "./scenario.service";
 import { SnippetService } from "../snippet/snippet.service";
 import { EnvironmentEntity, EnvironmentData } from "../environment/environment.entity";
 
-interface ValidateResult {
-  success: boolean;
-  description?: string;
-}
-
 interface BrowserHandle {
   browser: Browser;
   context: BrowserContext;
@@ -188,25 +183,6 @@ export class ScenarioSchedulerService {
         snips,
       );
 
-      if (step.validateCode) {
-        this.codeExecutor.validate(step.validateCode);
-        const { result } = await this.codeExecutor.execute(
-          page,
-          context,
-          step.validateCode,
-          this.stepLogger(stepRun.id, stepRun.runId),
-          getStepOutput,
-          creds,
-          env,
-          snips,
-          execOutput,
-        );
-        const vr = this.parseValidateResult(result);
-        if (!vr.success) throw new Error(vr.description ?? "Validation failed");
-        await this.passStepRun(stepRun, vr.description ?? null, execOutput);
-        return;
-      }
-
       await this.passStepRun(stepRun, null, execOutput);
     } catch (err) {
       const msg = (err as Error).message ?? String(err);
@@ -250,21 +226,6 @@ export class ScenarioSchedulerService {
     }
   }
 
-  // ── Validation helper ──────────────────────────────────────────────────────
-
-  private parseValidateResult(raw: unknown): ValidateResult {
-    if (typeof raw === "boolean") return { success: raw };
-    if (raw && typeof raw === "object") {
-      const r = raw as Record<string, unknown>;
-      return {
-        success: Boolean(r["success"]),
-        description:
-          r["description"] != null ? String(r["description"]) : undefined,
-      };
-    }
-    return { success: Boolean(raw) };
-  }
-
   // ── Pass / fail helpers ────────────────────────────────────────────────────
 
   private async passStepRun(