feat: initial gradle module metadata model

Signed-off-by: Sam Gammon <sam@elide.dev>

Author: sgammon

packages/builder/src/main/kotlin/elide/tooling/jvm/gradle/GradleAttributes.kt

@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2024-2025 Elide Technologies, Inc.
+ *
+ * Licensed under the MIT license (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   https://opensource.org/license/mit/
+ *
+ * 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.
+ */
+@file:OptIn(ExperimentalSerializationApi::class)
+
+package elide.tooling.jvm.gradle
+
+import kotlinx.serialization.ExperimentalSerializationApi
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+/**
+ * Attribute values can be strings, booleans, or numbers.
+ */
+@Serializable(with = GradleAttributeSerializer::class)
+public sealed interface AttributeValue {
+  @Serializable
+  @SerialName("string")
+  @JvmRecord
+  public data class StringValue(val value: String) : AttributeValue
+
+  @Serializable
+  @SerialName("boolean")
+  @JvmRecord
+  public data class BooleanValue(val value: Boolean) : AttributeValue
+
+  @Serializable
+  @SerialName("number")
+  @JvmRecord
+  public data class NumberValue(val value: Int) : AttributeValue
+}
+
+
+// Serialization helpers for common attribute names
+public object StandardAttributes {
+  public const val USAGE: String = "org.gradle.usage"
+  public const val CATEGORY: String = "org.gradle.category"
+  public const val LIBRARYELEMENTS: String = "org.gradle.libraryelements"
+  public const val BUNDLING: String = "org.gradle.bundling"
+  public const val STATUS: String = "org.gradle.status"
+  public const val DOCS_TYPE: String = "org.gradle.docstype"
+
+  // JVM specific
+  public const val JVM_VERSION: String = "org.gradle.jvm.version"
+  public const val JVM_ENVIRONMENT: String = "org.gradle.jvm.environment"
+
+  // Kotlin specific
+  public const val KOTLIN_PLATFORM_TYPE: String = "org.jetbrains.kotlin.platform.type"
+  public const val KOTLIN_NATIVE_TARGET: String = "org.jetbrains.kotlin.native.target"
+}
+
+// Common attribute values
+public object AttributeValues {
+  // Usage values
+  public const val JAVA_API: String = "java-api"
+  public const val JAVA_RUNTIME: String = "java-runtime"
+  public const val JAVA_RUNTIME_JARS: String = "java-runtime-jars"
+
+  // Category values
+  public const val LIBRARY: String = "library"
+  public const val PLATFORM: String = "platform"
+  public const val DOCUMENTATION: String = "documentation"
+
+  // Library elements values
+  public const val JAR: String = "jar"
+  public const val CLASSES: String = "classes"
+  public const val RESOURCES: String = "resources"
+  public const val SOURCES: String = "sources"
+  public const val JAVADOC: String = "javadoc"
+
+  // Status values
+  public const val RELEASE: String = "release"
+  public const val MILESTONE: String = "milestone"
+  public const val INTEGRATION: String = "integration"
+
+  // Bundling values
+  public const val EXTERNAL: String = "external"
+  public const val EMBEDDED: String = "embedded"
+  public const val SHADOWED: String = "shadowed"
+}