WUJI-PILOT-CASE-06-20260417 RETURN_STAT 文字追溯

• source case image board: ana-data/result/RUN-ANA-WUJI-BASELINE-PILOT-20260607-001/cases/WUJI-PILOT-CASE-06-20260417/case_image_board.md
• scope_status: RETURN_STAT_HELD_BOUNDARY_TABLE
• boundary_reason: HAS_RETURN_STAT_HELD_BOUNDARY_LOT
• 文字页只用于追溯；人工审核第一入口仍是 case_image_board.md。