feat(b08): 안 고른 돌쌓기 뒷길이를 품셈 13-4-4 [주]⑩ 뒷길이 표준 하한으로 — 범위 안 첫 규격(메 ~3m 36→45) · 전개·양식·구조물도 한 벌 · 사유에 원문 줄 번호(B1)

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016VBGFXB9AbJBwXP19z75Qq

B08_Quantity/B08_Quantity_Engine_StructureFigure.py

@@ -27,7 +27,7 @@ from __future__ import annotations
 from typing import Any
 
 from B08_Quantity.B08_Quantity_Engine_Pipe import NOTE_DEFAULT_WALL
-from B08_Quantity.B08_Quantity_Engine_StructureSheet import slope_of
+from B08_Quantity.B08_Quantity_Engine_StructureSheet import sheet_is_wet, slope_of
 from B08_Quantity.B08_Quantity_Engine_UnitQuantity import (
     _back_length,
     back_length_default_note,
@@ -94,9 +94,14 @@ def back_length_cm(sheet: dict[str, Any]) -> tuple[int, str | None]:
     양식 장은 양식이 푼 값(`formula_sheet.vars.L3`), 전개 장은 `_back_length` — 표와 한 벌.
     """
     options = sheet.get("options") or {}
+    wet, height = sheet_is_wet(sheet), float(sheet.get("height_m") or 0.0)
     solved = ((sheet.get("formula_sheet") or {}).get("vars") or {}).get("L3")
-    back = int(float(solved)) if isinstance(solved, (int, float)) else _back_length(options)
-    return back, back_length_default_note(options, back)
+    back = (
+        int(float(solved))
+        if isinstance(solved, (int, float))
+        else _back_length(options, wet=wet, height_m=height)
+    )
+    return back, back_length_default_note(options, back, wet=wet, height_m=height)
 
 
 def figure_reason(sheet: dict[str, Any]) -> str | None: