feat: Begin using Tagged types

Sources/ManualDCore/Extensions/Numbers+string.swift

@@ -1,4 +1,17 @@
 import Foundation
+import Tagged
+
+extension Tagged where RawValue == Double {
+  public func string(digits: Int = 2) -> String {
+    rawValue.string(digits: digits)
+  }
+}
+
+extension Tagged where RawValue == Int {
+  public func string() -> String {
+    rawValue.string()
+  }
+}
 
 extension Double {
 

Sources/ManualDCore/FrictionRate.swift

@@ -7,13 +7,13 @@ public struct FrictionRate: Codable, Equatable, Sendable {
   /// minus the ``ComponentPressureLoss``es for the project.
   public let availableStaticPressure: Double
   /// The calculated design friction rate value.
-  public let value: Double
+  public let value: DesignFrictionRate
   /// Whether the design friction rate is within a valid range.
   public var hasErrors: Bool { error != nil }
 
   public init(
     availableStaticPressure: Double,
-    value: Double
+    value: DesignFrictionRate
   ) {
     self.availableStaticPressure = availableStaticPressure
     self.value = value

Sources/ManualDCore/TaggedTypes.swift

@@ -0,0 +1,7 @@
+import Tagged
+
+public enum CFMTag {}
+public typealias CFM = Tagged<CFMTag, Int>
+
+public enum DesignFrictionRateTag {}
+public typealias DesignFrictionRate = Tagged<DesignFrictionRateTag, Double>