feat: Begins manual d core models.

.gitignore

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+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

Package.swift

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+// swift-tools-version: 6.2
+
+import PackageDescription
+
+let package = Package(
+  name: "swift-manual-d",
+  products: [
+    .library(name: "swift-manual-d", targets: ["swift-manual-d"]),
+    .library(name: "ManualDCore", targets: ["ManualDCore"]),
+  ],
+  targets: [
+    .target(
+      name: "swift-manual-d"
+    ),
+    .target(
+      name: "ManualDCore"
+    ),
+    .testTarget(
+      name: "swift-manual-dTests",
+      dependencies: ["swift-manual-d"]
+    ),
+  ]
+)

Sources/ManualDCore/ComponentPressureLosses.swift

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+import Foundation
+
+public typealias ComponentPressureLosses = [String: Double]
+
+extension ComponentPressureLosses {
+  public var totalLosses: Double { values.reduce(0) { $0 + $1 } }
+}

Sources/ManualDCore/CoolingLoad.swift

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+import Foundation
+
+public struct CoolingLoad: Codable, Equatable {
+  public let total: Double
+  public let sensible: Double
+  public var latent: Double { total - sensible }
+  public var shr: Double { sensible / total }
+
+  public init(total: Double, sensible: Double) {
+    self.total = total
+    self.sensible = sensible
+  }
+}

Sources/ManualDCore/EquipmentInfo.swift

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+import Foundation
+
+public struct EquipmentInfo: Codable, Equatable {
+  public let staticPressure: Double
+  public let heatingCFM: Int
+  public let coolingCFM: Int
+
+  public init(
+    staticPressure: Double = 0.5,
+    heatingCFM: Int,
+    coolingCFM: Int
+  ) {
+    self.staticPressure = staticPressure
+    self.heatingCFM = heatingCFM
+    self.coolingCFM = coolingCFM
+  }
+}

Sources/ManualDCore/Room.swift

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+import Foundation
+
+public struct Room: Codable, Equatable {
+  public let name: String
+  public let heatingLoad: Double
+  public let coolingLoad: CoolingLoad
+  public let registerCount: Int
+
+  public init(
+    name: String,
+    heatingLoad: Double,
+    coolingLoad: CoolingLoad,
+    registerCount: Int = 1
+  ) {
+    self.name = name
+    self.heatingLoad = heatingLoad
+    self.coolingLoad = coolingLoad
+    self.registerCount = registerCount
+  }
+}

Sources/swift-manual-d/swift_manual_d.swift

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+// The Swift Programming Language
+// https://docs.swift.org/swift-book

Tests/swift-manual-dTests/swift_manual_dTests.swift

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+import Testing
+@testable import swift_manual_d
+
+@Test func example() async throws {
+    // Write your test here and use APIs like `#expect(...)` to check expected conditions.
+}