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/application/WebScriptExportService.ts

@@ -243,11 +243,11 @@ const readCapture = async (
         incomplete: retry.cleanup !== undefined,
         cause: cause.cleanupCause,
       };
-      if (cause.outcome.kind === "completed")
-        return ok({ bytes: cause.outcome.value as Buffer, cleanup });
+      if (retry.outcome.kind === "completed")
+        return ok({ bytes: retry.outcome.value as Buffer, cleanup });
       const primary = captureReadFailure(
         path,
-        cause.outcome.cause,
+        retry.outcome.cause,
         signal,
         retry.cleanup === undefined ? { cause: cause.cleanupCause } : undefined,
       );