- Empty/unanswerable SOP queries now return the fixed 「未在已入库 SOP 中找到明确依据」
response instead of falling back to seed answers (no fake answers)
- Record knowledge_gap (question/category/position/source) whenever search
yields no evidence — feeds the phase-two open question board
- Extract NO_CLEAR_SOP_EVIDENCE constant shared by digest prompt and checks
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