feat: Initial commit

Sources/ManualS/Internal/RequiredKW.swift

@@ -0,0 +1,24 @@
+import Models
+import Validations
+
+extension RequiredKW.Request {
+  func respond() async throws -> RequiredKW.Response {
+    try await validate()
+    let capacityAtDesign = self.capacityAtDesign ?? 0
+    let requiredKW = (Double(heatLoss) - Double(capacityAtDesign)) / 3413
+    return .init(requiredKW: requiredKW)
+  }
+}
+
+extension RequiredKW.Request: AsyncValidatable {
+
+  @inlinable
+  public var body: some AsyncValidation<Self> {
+    AsyncValidator.accumulating {
+      AsyncValidator.greaterThan(\.heatLoss, 0)
+      AsyncValidator.validate(\.capacityAtDesign) {
+        AsyncValidator.greaterThan(0).optional()
+      }
+    }
+  }
+}