Optimize dependencies and update project setup

Reduces the library’s transitive footprint by making JDBC drivers and the connection pool `compileOnly`, so applications are no longer forced to pull in specific database drivers they may not use. It also stops the Spring Boot starter from implicitly choosing a Ktor client engine, requiring consumers to select the engine that best fits their environment and avoiding version and engine conflicts. The updated docs clarify these explicit dependency requirements, and the logging configuration helps keep test logs readable while still surfacing useful debug information.

- Switched optional JDBC drivers to `compileOnly` for reduced transitive dependencies.
- Added `logback.xml` to configure logging levels and prevent excessive logs.
- Exclude Ktor client engine from spring-boot transitive dependencies and updated documentation

Author: kpavlov

a2a/a2a-server/src/jvmTest/kotlin/ai/koog/a2a/server/.gitkeep

@@ -35,10 +35,10 @@ kotlin {
                 api(libs.exposed.jdbc)
                 api(libs.exposed.json)
                 api(libs.exposed.kotlin.datetime)
-                api(libs.postgresql)
-                api(libs.mysql)
-                api(libs.h2)
-                api(libs.sqlite)
+                compileOnly(libs.h2)
+                compileOnly(libs.mysql)
+                compileOnly(libs.postgresql)
+                compileOnly(libs.sqlite)
                 implementation(libs.hikaricp)
             }
         }
@@ -52,6 +52,11 @@ kotlin {
                 implementation(libs.testcontainers)
                 implementation(libs.testcontainers.postgresql)
                 implementation(libs.testcontainers.mysql)
+
+                runtimeOnly(libs.postgresql)
+                runtimeOnly(libs.mysql)
+                runtimeOnly(libs.h2)
+                runtimeOnly(libs.sqlite)
             }
         }
     }

agents/agents-features/agents-features-sql/build.gradle.kts

@@ -0,0 +1,14 @@
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <logger name="ai.koog" level="debug" />
+    <logger name="com.github.dockerjava" level="error" />
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

agents/agents-features/agents-features-sql/src/jvmTest/resources/logback.xml

@@ -19,11 +19,13 @@ ready-to-use beans for dependency injection. It supports all major LLM providers
 
 ### 1. Add Dependency
 
-Add the Spring Boot starter to your `build.gradle.kts`:
+Add the Koog Spring Boot starter and [Ktor Client Engine](https://ktor.io/docs/client-engines.html#jvm) 
+to your `build.gradle.kts` or `pom.xml`:
 
 ```kotlin
 dependencies {
     implementation("ai.koog:koog-spring-boot-starter:$koogVersion")
+    implementation("io.ktor:ktor-client-okhttp-jvm:$ktorVersion")
 }
 ```
 

docs/docs/spring-boot.md

@@ -34,10 +34,10 @@ dependencies {
     implementation(project.dependencies.platform(libs.spring.boot.bom))
     api(libs.bundles.spring.boot.core)
     api(libs.reactor.kotlin.extensions)
-    runtimeOnly(libs.ktor.client.apache5)
 
     testImplementation(libs.spring.boot.starter.test)
     testRuntimeOnly(libs.junit.platform.launcher)
+    testRuntimeOnly(libs.ktor.client.apache5)
 }
 
 publishToMaven()