fix(ci): align FAT fixtures and consolidate duplicated workflow helpers

Declare the synthetic 4 KiB Mach-O slice alignment accurately while preserving the IDA thinning scenario. Share web cleanup aggregation and process-trace fixture facts instead of duplicating them across consumers and tests; keep the 3% duplication threshold unchanged.

Validation: npm run check:ci, test discovery, and 42 focused IDA, process-trace, web workflow and cleanup boundary tests. Duplication falls from 3.01% to 2.99%.

src/application/WebModuleTraceService.ts

@@ -1,3 +1,4 @@
+import { closeOwnedWebResources } from "./closeOwnedWebResources.js";
 import { isAbsolute } from "node:path";
 import { z } from "zod";
 import type { AnalysisError } from "../domain/analysisErrorBase.js";
@@ -271,21 +272,6 @@ export class WebModuleTraceService {
   }
 }
 
-const closeOwnedWebResources = async (
-  close: readonly ((() => Promise<void>) | undefined)[],
-  message: string,
-): Promise<void> => {
-  const results = await Promise.allSettled(
-    close.flatMap((owner) =>
-      owner === undefined ? [] : [Promise.resolve().then(owner)],
-    ),
-  );
-  const failures = results.flatMap((result) =>
-    result.status === "rejected" ? [result.reason] : [],
-  );
-  if (failures.length > 0) throw new AggregateError(failures, message);
-};
-
 const admitContext = (
   value: string,
   path: readonly string[],