Address PR review: rename package to pw.binom.agui, add native KMP targets, fix native event serialization

- Rename module package com.agui -> pw.binom.agui (dirs + code + root group)
- Expand KMP targets on all modules: jvm + macOS/ios/Linux/mingw (no Android)
- Server native via ktor-server-cio; client native via ktor-client-cio
- Annotate sealed interface BaseEvent with @Serializable so the sealed
  serializer resolves without reflection on Kotlin/Native (was reflection-only
  on JVM, so native tests failed with 'Serializer for class BaseEvent not found')

server/build.gradle.kts

@@ -6,6 +6,14 @@ plugins {
 kotlin {
     jvmToolchain(21)
     jvm()
+    macosX64()
+    macosArm64()
+    iosX64()
+    iosArm64()
+    iosSimulatorArm64()
+    linuxX64()
+    linuxArm64()
+    mingwX64()
 
     sourceSets {
         commonMain.dependencies {
@@ -18,6 +26,9 @@ kotlin {
         jvmMain.dependencies {
             implementation(libs.ktor.server.netty)
         }
+        nativeMain.dependencies {
+            implementation(libs.ktor.server.cio)
+        }
         jvmTest.dependencies {
             implementation(kotlin("test"))
             implementation(libs.kotlinx.coroutines.test)

server/src/commonMain/kotlin/pw/binom/agui/server/Agui.kt

@@ -1,10 +1,10 @@
-package com.agui.server
+package pw.binom.agui.server
 
-import com.agui.api.agent.Agent
-import com.agui.api.event.BaseEvent
-import com.agui.api.event.RunErrorEvent
-import com.agui.api.run.RunAgentInput
-import com.agui.api.serialization.AguiJson
+import pw.binom.agui.api.agent.Agent
+import pw.binom.agui.api.event.BaseEvent
+import pw.binom.agui.api.event.RunErrorEvent
+import pw.binom.agui.api.run.RunAgentInput
+import pw.binom.agui.api.serialization.AguiJson
 import io.ktor.server.application.Application
 import io.ktor.server.application.ApplicationCall
 import io.ktor.server.application.call

server/src/jvmMain/kotlin/pw/binom/agui/server/demo/SampleServer.kt

@@ -1,13 +1,13 @@
-package com.agui.server.demo
+package pw.binom.agui.server.demo
 
-import com.agui.api.agent.Agent
-import com.agui.api.event.RunFinishedEvent
-import com.agui.api.event.RunStartedEvent
-import com.agui.api.event.StateSnapshotEvent
-import com.agui.api.event.TextMessageContentEvent
-import com.agui.api.event.TextMessageEndEvent
-import com.agui.api.event.TextMessageStartEvent
-import com.agui.server.agui
+import pw.binom.agui.api.agent.Agent
+import pw.binom.agui.api.event.RunFinishedEvent
+import pw.binom.agui.api.event.RunStartedEvent
+import pw.binom.agui.api.event.StateSnapshotEvent
+import pw.binom.agui.api.event.TextMessageContentEvent
+import pw.binom.agui.api.event.TextMessageEndEvent
+import pw.binom.agui.api.event.TextMessageStartEvent
+import pw.binom.agui.server.agui
 import io.ktor.server.engine.embeddedServer
 import io.ktor.server.netty.Netty
 import kotlinx.coroutines.flow.flow

server/src/jvmTest/kotlin/pw/binom/agui/server/AguiServerTest.kt

@@ -1,18 +1,18 @@
-package com.agui.server
+package pw.binom.agui.server
 
-import com.agui.api.agent.Agent
-import com.agui.api.event.RunErrorEvent
-import com.agui.api.event.RunFinishedEvent
-import com.agui.api.event.RunStartedEvent
-import com.agui.api.event.StateSnapshotEvent
-import com.agui.api.event.TextMessageContentEvent
-import com.agui.api.event.TextMessageEndEvent
-import com.agui.api.event.TextMessageStartEvent
-import com.agui.api.message.Message
-import com.agui.api.message.MessageRole
-import com.agui.api.run.RunAgentInput
-import com.agui.api.state.mutableState
-import com.agui.client.HttpAgent
+import pw.binom.agui.api.agent.Agent
+import pw.binom.agui.api.event.RunErrorEvent
+import pw.binom.agui.api.event.RunFinishedEvent
+import pw.binom.agui.api.event.RunStartedEvent
+import pw.binom.agui.api.event.StateSnapshotEvent
+import pw.binom.agui.api.event.TextMessageContentEvent
+import pw.binom.agui.api.event.TextMessageEndEvent
+import pw.binom.agui.api.event.TextMessageStartEvent
+import pw.binom.agui.api.message.Message
+import pw.binom.agui.api.message.MessageRole
+import pw.binom.agui.api.run.RunAgentInput
+import pw.binom.agui.api.state.mutableState
+import pw.binom.agui.client.HttpAgent
 import io.ktor.client.plugins.sse.SSE
 import io.ktor.server.application.application
 import io.ktor.server.testing.testApplication