Freeze validated CM93 importer baseline docs and audits

docs/CM93_Importer冻结基线_v1.md

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+# CM93 Importer 冻结基线 v1
+
+日期：2026-09-02  
+仓库：CM95  
+基线 commit：`9d56592cadf7e047fb059e5a8746188595a08b43`  
+基线 tag：`cm93-mysql-importer-baseline-v1`
+
+## 结论
+
+CM93JAPAN Dataset ID=1 的 CM93 → MySQL importer 已完成：
+
+- Geometry normalization 全量验收；
+- 非 Geometry 数据完整性全量验收；
+- 原始 CM93 source file SHA-256 对账。
+
+结果：
+
+```text
+Geometry Audit:     OVERALL: PASS
+Non-Geometry Audit: OVERALL: PASS
+```
+
+## 数据基线
+
+| 项目 | 数量 / 结果 |
+|---|---:|
+| Cells | 784 |
+| Features | 322465 |
+| Attributes | 405153 |
+| Soundings | 275700 |
+| Coverages | 1156 |
+| Area | 81080 |
+| Area valid | 81080 |
+| Coverage valid | 1156 |
+| Feature repaired | 55 |
+| Coverage repaired | 3 |
+| Feature geometry issues | 0 |
+| Coverage geometry issues | 0 |
+| raw_geotype=16 | 4406 |
+| raw_geotype=16 issues | 0 |
+| Area bbox mismatch | 0 |
+| Source files checked | 784 |
+| Source files missing | 0 |
+| Source size mismatch | 0 |
+| Source SHA-256 mismatch | 0 |
+
+## 冻结 Geometry 规则
+
+Valid Area / Coverage：
+
+```text
+PASS-THROUGH
+```
+
+Invalid Area / Coverage：
+
+```text
+boundary noding
+→ polygonize_full
+→ odd-even face selection
+→ union selected faces
+→ GEOS normalize
+→ valid Polygon / MultiPolygon
+```
+
+禁止生产写回策略：
+
+```text
+make_valid()
+ST_MakeValid()
+buffer(0)
+```
+
+`raw_geotype=16` 是正常 parent/no-geometry，不属于 geometry issue。
+
+normalized Area 的 bbox 必须来自最终 geometry.bounds。
+
+## Raw source
+
+必须保留：
+
+```text
+raw_feature_blob
+raw_attribute_blob
+chart_raw_record
+source_record_index
+```
+
+## 长期回归入口
+
+```text
+tools/cm93_mysql_final_geometry_audit.py
+tools/cm93_mysql_non_geometry_final_audit.py
+```
+
+## 核心生产文件
+
+```text
+src/cm93db/geometry.py
+src/cm93db/importer.py
+sql/001_schema_mysql57.sql
+```
+
+本次文档收尾不修改上述生产逻辑。
+
+## PBF
+
+```text
+OUT OF SCOPE / FROZEN
+```
+
+PBF 必须作为独立后续阶段明确启动。