fix(filesystem): preserve digest failures through cleanup cancellation

Record cancellation at file checkpoints and before owner handoff. Keep physical hash failures, exact reasons, completed facts and failed-close owners distinct through artifact and provider projections and cleanup retries.

Refs #4598. Validated with 566 passing affected tests and 22 platform skips; final Kuna cleanup reason rerun passed 43 tests. No Android device or real JADX/Kuna execution claimed.

src/reference/ReferenceSourceReaderFile.ts

@@ -1,3 +1,4 @@
+import { regularFileCancellation } from "../filesystem/OwnedRegularFile.js";
 import type { BigIntStats } from "node:fs";
 import type { FileHandle } from "node:fs/promises";
 import { dirname } from "node:path";
@@ -278,7 +279,7 @@ const readStableFileEntry = async (
       retain(cause.owner);
       cause = cause.cause;
     }
-    if (isAborted(signal))
+    if (regularFileCancellation(cause) !== undefined || isAborted(signal))
       return entryFailure(
         path,
         "file",