Expose product length calculation through MCP

rollcalc_mcp_tools.py

@@ -7,6 +7,7 @@ from typing import Any
 from roll_calculation import (
     ArticleRepository,
     calculate_material_weight,
+    calculate_product_length,
     calculate_roll,
     get_article,
     transport_roll_inputs_from_roll_calculation,
@@ -41,6 +42,26 @@ def calculate_material_weight_result(
     )
 
 
+def calculate_product_length_result(
+    *,
+    target_roll_diameter_mm: float,
+    core_diameter_mm: float,
+    thickness_mm: float,
+    thickness_stddev_mm: float | None = None,
+    width_m: float | None = None,
+    area_weight_g_m2: float | None = None,
+) -> dict[str, Any]:
+    """Delegate target-diameter product-length calculation to the domain."""
+    return calculate_product_length(
+        target_roll_diameter_mm=target_roll_diameter_mm,
+        core_diameter_mm=core_diameter_mm,
+        thickness_mm=thickness_mm,
+        thickness_stddev_mm=thickness_stddev_mm,
+        width_m=width_m,
+        area_weight_g_m2=area_weight_g_m2,
+    )
+
+
 def calculate_roll_diameter_result(
     *,
     article_number: str | None = None,