Raise default LLM confidence thresholds and automatically retry segments with low-confidence corrections

tests/test_corrections.py

@@ -50,6 +50,10 @@ def test_apply_corrections_ignores_below_threshold():
 
     assert result.transcript[0].text == "I ask Chontia for help."
     assert result.skipped == []
+    assert result.ignored_ids == [1]
+    assert len(result.ignored) == 1
+    assert result.ignored[0].id == 1
+    assert result.ignored[0].reason == "correction confidence below threshold"
 
 
 def test_apply_corrections_allows_multiple_distinct_spans_in_one_segment():