fix: add repository configuration for Kotlin 2.2.0 dependencies

Adds proper Maven repository configuration to resolve Kotlin 2.2.0
dependencies when building with composite builds or Gradle 9.x.

Changes:
- Add settings.gradle.kts with pluginManagement to buildSrc/ and gradle/plugins/
- Update buildSrc/build.gradle.kts and gradle/plugins/build.gradle.kts with Maven repos
- Update root settings.gradle.kts with pluginManagement and dependencyResolutionManagement

This fixes dependency resolution errors when Kotlin 2.2.0+ is not available
on the Apache Maven mirror (repo.maven.apache.org) but is available on
canonical Maven Central (repo1.maven.org) and JetBrains Kotlin dev repo.

Tested with: Elide project composite build integration
Verified: Builds successfully with Kotlin 2.2.21 and kotlinx-serialization 1.9.0

Author: rjwalters

buildSrc/build.gradle.kts

@@ -3,6 +3,15 @@ plugins {
 }
 
 repositories {
+    maven {
+        url = uri("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/dev")
+        content {
+            includeGroupByRegex("org\\.jetbrains.*")
+        }
+    }
+    maven {
+        url = uri("https://repo1.maven.org/maven2/")
+    }
     gradlePluginPortal()
 }
 

buildSrc/settings.gradle.kts

@@ -0,0 +1,16 @@
+pluginManagement {
+    repositories {
+        maven {
+            url = uri("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/dev")
+            content {
+                includeGroupByRegex("org\\.jetbrains.*")
+            }
+        }
+        maven {
+            url = uri("https://repo1.maven.org/maven2/")
+        }
+        gradlePluginPortal()
+    }
+}
+
+rootProject.name = "buildSrc"

gradle/plugins/build.gradle.kts

@@ -1,11 +1,34 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
+buildscript {
+    repositories {
+        maven {
+            url = uri("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/dev")
+            content {
+                includeGroupByRegex("org\\.jetbrains.*")
+            }
+        }
+        maven {
+            url = uri("https://repo1.maven.org/maven2/")
+        }
+        gradlePluginPortal()
+    }
+}
+
 plugins {
     `kotlin-dsl`
 }
 
 repositories {
-    mavenCentral()
+    maven {
+        url = uri("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/dev")
+        content {
+            includeGroupByRegex("org\\.jetbrains.*")
+        }
+    }
+    maven {
+        url = uri("https://repo1.maven.org/maven2/")
+    }
     gradlePluginPortal()
 }
 

gradle/plugins/settings.gradle.kts

@@ -0,0 +1,16 @@
+pluginManagement {
+    repositories {
+        maven {
+            url = uri("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/dev")
+            content {
+                includeGroupByRegex("org\\.jetbrains.*")
+            }
+        }
+        maven {
+            url = uri("https://repo1.maven.org/maven2/")
+        }
+        gradlePluginPortal()
+    }
+}
+
+rootProject.name = "plugins"

settings.gradle.kts

@@ -1,7 +1,36 @@
+pluginManagement {
+    repositories {
+        maven {
+            url = uri("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/dev")
+            content {
+                includeGroupByRegex("org\\.jetbrains.*")
+            }
+        }
+        maven {
+            url = uri("https://repo1.maven.org/maven2/")
+        }
+        gradlePluginPortal()
+    }
+}
+
 plugins {
     id("org.gradle.toolchains.foojay-resolver-convention") version("1.0.0")
 }
 
+dependencyResolutionManagement {
+    repositories {
+        maven {
+            url = uri("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/dev")
+            content {
+                includeGroupByRegex("org\\.jetbrains.*")
+            }
+        }
+        maven {
+            url = uri("https://repo1.maven.org/maven2/")
+        }
+    }
+}
+
 rootProject.name = "ktoml"
 
 includeBuild("gradle/plugins")