Retrieved is
not retained.
A context-packing defect removed evidence before it reached the prompt. Compare the reported visibility result.
Follow the retained set.
Compare the reported run without turning visibility into an accuracy claim.
221 retrieved.
103 retained.
118 retrieved chunks were lost during packing.
Reported retrieval: 221 / 250. Before: 103 / 221 retained. After: 221 / 221 at an 8,000-token budget. Answer-quality remeasurement remains open.
One repair does not close another test.
The observed packing loss was 118 / 221, or 53.4% of retrieved chunks.
A third left-truncation mechanism recorded zero events in the run and remains a latent risk; it should not be described as a third active cause.
The Craton weight-path acceptance failure is independent of this context-packing defect.
Visibility repair is not answer accuracy.
The reported fix restored the retained set at an 8,000-token budget. Answer-quality remeasurement remains open.