Prevent identical replies (especially for images and examples)

When you want to keep the conversation but break the inertia

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Hard context pivot:
Ignore all previous examples, images, and conclusions related to this topic.
Treat this as a fresh sub-problem inside the same conversation.
Explicitly blacklist previously shown examples and do not reuse them.
If you are uncertain whether a result is genuinely new or non-retail, say 'uncertain' rather than filling the gap.
Optimize for novel retrieval, not continuity.