DeepSeek occasionally regurgitates the system prompt verbatim
("Constraints: ≤60 words...", "Example good: ..."). Three-pronged fix:
1. Removed the inline good/bad example blocks from the per-group and
aggregate system prompts — DeepSeek was treating them as templates
to copy. The hard constraints alone are clear enough.
2. Expanded the LEAK_PATTERNS list to catch the prompt-label echoes
that still occasionally slip through ("Key observations:", "The
indicators are:", "Must cite ...", "Should give ...", bare "Key:").
Cleanup now runs up to 6 passes for compound leakage.
3. Added looks_like_leakage() — if the cleaned output still contains
tell-tale phrases ("≤60 words", "instructions:", etc.), the summary
is skipped rather than persisted. Logs a 'leakage_detected' warning
and an ai_calls row with status=leaked so we can see the failure
rate over time. The previous good summary stays visible.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Giorgio Gilestro
2f223b75a3