feat(ai): add GLM Interactions API prototype

GeminiLanguageModel/Package.swift

@@ -31,12 +31,24 @@ let package = Package(
       targets: ["GeminiLanguageModel"]
     )
   ],
+  traits: [
+    .trait(
+      name: "GeminiDeveloperAPIEnvironmentAuth",
+      description:
+        """
+        Enables public initialization with the Gemini Developer API using the GOOGLE_API_KEY or \
+        GEMINI_API_KEY environment variable.
+        """
+    )
+  ],
   targets: [
     .target(
       name: "GeminiLanguageModel",
       dependencies: [
         "GeminiAPIClient",
         "GeminiAPIDataModels",
+        "InteractionsDataModels",
+        "GeminiSharedDataModels",
       ],
       swiftSettings: defaultSwiftSettings
     ),
@@ -66,7 +78,9 @@ let package = Package(
     .target(
       name: "GeminiAPIClient",
       dependencies: [
-        "GeminiAPIDataModels"
+        "GeminiAPIDataModels",
+        "InteractionsDataModels",
+        "GeminiSharedDataModels",
       ],
       swiftSettings: defaultSwiftSettings
     ),
@@ -78,8 +92,28 @@ let package = Package(
       ],
       swiftSettings: defaultSwiftSettings
     ),
+    .target(
+      name: "GeminiSharedDataModels",
+      swiftSettings: [
+        .enableUpcomingFeature("ExistentialAny"),
+        .enableUpcomingFeature("MemberImportVisibility"),
+      ]
+    ),
     .target(
       name: "GeminiAPIDataModels",
+      dependencies: [
+        "GeminiSharedDataModels"
+      ],
+      swiftSettings: [
+        .enableUpcomingFeature("ExistentialAny"),
+        .enableUpcomingFeature("MemberImportVisibility"),
+      ]
+    ),
+    .target(
+      name: "InteractionsDataModels",
+      dependencies: [
+        "GeminiSharedDataModels"
+      ],
       swiftSettings: [
         .enableUpcomingFeature("ExistentialAny"),
         .enableUpcomingFeature("MemberImportVisibility"),

GeminiLanguageModel/Samples/gfm/Package.swift

@@ -0,0 +1,69 @@
+// swift-tools-version: 6.1
+
+// Copyright 2026 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import PackageDescription
+
+let defaultSwiftSettings: [SwiftSetting] = [
+  .enableUpcomingFeature("ExistentialAny"),
+  .enableUpcomingFeature("InternalImportsByDefault"),
+  .enableUpcomingFeature("MemberImportVisibility"),
+]
+
+let package = Package(
+  name: "gfm",
+  platforms: [.macOS(.v15), .iOS(.v18)],
+  products: [
+    .executable(
+      name: "gfm",
+      targets: ["GFM"]
+    ),
+    .library(
+      name: "GFMCore",
+      targets: ["GFMCore"]
+    ),
+  ],
+  dependencies: [
+    .package(path: "../../", traits: ["GeminiDeveloperAPIEnvironmentAuth"]),
+    .package(url: "https://github.com/apple/swift-argument-parser.git", from: "1.8.2"),
+  ],
+  targets: [
+    .executableTarget(
+      name: "GFM",
+      dependencies: [
+        "GFMCore",
+        .product(name: "ArgumentParser", package: "swift-argument-parser"),
+      ],
+      swiftSettings: defaultSwiftSettings
+    ),
+    .target(
+      name: "GFMCore",
+      dependencies: [
+        .product(name: "GeminiLanguageModel", package: "GeminiLanguageModel"),
+        .product(name: "ArgumentParser", package: "swift-argument-parser"),
+      ],
+      swiftSettings: defaultSwiftSettings
+    ),
+    .testTarget(
+      name: "GFMTests",
+      dependencies: [
+        "GFMCore",
+        .product(name: "ArgumentParser", package: "swift-argument-parser"),
+      ],
+      swiftSettings: defaultSwiftSettings
+    ),
+  ],
+  swiftLanguageModes: [.v6]
+)