test(patreon): fix #704 — quarantine status + budget-cut cursor assertions

Two test breaks from the structured-results change:
- An existing downloader test pinned a corrupt file to status "error";
  it's now the distinct "quarantined" status (the new behavior). Updated
  it + removed the duplicate I'd added.
- The budget-cut ingester test asserted the checkpoint cursor was the last
  FULLY-processed page (CUR1); it's actually the page we were cut on (CUR2,
  entered + cursor emitted before the budget check), matching the prior
  parse_last_cursor(last) semantics. Corrected the assertion.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/test_patreon_ingester.py

@@ -280,7 +280,10 @@ async def test_backfill_budget_cut_returns_partial_with_progress(
     assert result.return_code == -1
     assert result.files_downloaded == 1  # post1 downloaded before the cut
     assert downloader.download_calls == 1  # post2's body never ran
-    assert result.cursor == "CUR1"  # structured checkpoint (plan #704)
+    # The checkpoint is the page we were CUT ON (CUR2 — entered, cursor emitted,
+    # then the budget check broke before processing it); the next chunk resumes
+    # there. Structured (plan #704), matching the old parse_last_cursor(last).
+    assert result.cursor == "CUR2"
 
 
 # --- recovery -------------------------------------------------------------