源文件：~/Downloads/llm_cost_stats_2026_05_export.xlsx
新文件：~/Downloads/llm_cost_stats_2026_05_merged_two_tables.xlsx
MaybeSheet：http://localhost:3003/docs/spreadsheets/d/6a46138f89f67dfc24f5e3cb
结果：PASS，top-level engine = composite，top-level selected_engine = None
| index | worksheet_name | requested_engine | selected_engine | reason | row_count | column_count |
|---|---|---|---|---|---|---|
| 0 | 汇总报表 | auto | excelize | auto: worksheet appears layout/workbook-oriented | 404 | 7 |
| 1 | 计价明细_合并_1 | auto | pg | auto: worksheet has more than 10000 rows | 22698 | 20 |
| 2 | 计价明细_合并_2 | auto | pg | auto: worksheet has more than 10000 rows | 22697 | 20 |
| index | gid | worksheet_name | data_engine | style_engine | formula_engine | sql_engine |
|---|---|---|---|---|---|---|
| 0 | 0 | 汇总报表 | excelize | excelize | excelize | excelize |
| 1 | 1 | 计价明细_合并_1 | pg | none | pg | pg |
| 2 | 2 | 计价明细_合并_2 | pg | none | pg | pg |
原始 JSON 证据位于：docs/superpowers/reports/import-engine-merged-20260702-153018