feat: Starts manual-d client and adds friction rate calculation and tests.

Sources/ManualDCore/ComponentPressureLosses.swift

@@ -2,6 +2,16 @@ import Foundation
 
 public typealias ComponentPressureLosses = [String: Double]
 
-extension ComponentPressureLosses {
-  public var totalLosses: Double { values.reduce(0) { $0 + $1 } }
-}
+#if DEBUG
+  extension ComponentPressureLosses {
+    public static var mock: Self {
+      [
+        "evaporator-coil": 0.2,
+        "filter": 0.1,
+        "supply-outlet": 0.03,
+        "return-grille": 0.03,
+        "balancing-damper": 0.03,
+      ]
+    }
+  }
+#endif

Sources/ManualDCore/CoolingLoad.swift

@@ -1,6 +1,6 @@
 import Foundation
 
-public struct CoolingLoad: Codable, Equatable {
+public struct CoolingLoad: Codable, Equatable, Sendable {
   public let total: Double
   public let sensible: Double
   public var latent: Double { total - sensible }

Sources/ManualDCore/EffectiveLengthGroup.swift

@@ -2,7 +2,7 @@ import Foundation
 
 // TODO: Add other description / label for items that have same group & letter, but
 //       different effective length.
-public struct EffectiveLengthGroup: Codable, Equatable {
+public struct EffectiveLengthGroup: Codable, Equatable, Sendable {
   public let group: Int
   public let letter: String
   public let effectiveLength: Int
@@ -24,7 +24,7 @@ public struct EffectiveLengthGroup: Codable, Equatable {
 
 extension EffectiveLengthGroup {
 
-  public enum Category: String, Codable, Equatable {
+  public enum Category: String, Codable, Equatable, Sendable {
     case any
     case supply
     case `return`
@@ -32,7 +32,7 @@ extension EffectiveLengthGroup {
 
 }
 
-public let effectiveLengthsLookup: [String: EffectiveLengthGroup] {
+public let effectiveLengthsLookup: [String: EffectiveLengthGroup] = {
   [
     "1a": .init(group: 1, letter: "a", effectiveLength: 35, category: .supply),
     "1b": .init(group: 1, letter: "b", effectiveLength: 10, category: .supply),
@@ -625,4 +625,4 @@ public let effectiveLengthsLookup: [String: EffectiveLengthGroup] {
     "12u": .init(group: 12, letter: "u", effectiveLength: 25, category: .any),
     "12v": .init(group: 12, letter: "v", effectiveLength: 30, category: .any),
   ]
-}
+}()

Sources/ManualDCore/Room.swift

@@ -1,6 +1,6 @@
 import Foundation
 
-public struct Room: Codable, Equatable {
+public struct Room: Codable, Equatable, Sendable {
   public let name: String
   public let heatingLoad: Double
   public let coolingLoad: CoolingLoad