refactor(message-log-api): split MessageStore into read-only and mutable interfaces

- Introduced `MutableMessageStore` for producers with an `append` operation, separate from read-only `MessageStore`.
- Updated all consumers and implementations to use the appropriate interface (`read-only` for observers, `mutable` for producers).
- Improves modularity and ensures compile-time guarantees against unintended write operations in the audit log.

message-log-api/src/commonMain/kotlin/pw/binom/agentik/messageLog/MessageStore.kt

@@ -4,21 +4,27 @@ import kotlinx.coroutines.flow.Flow
 import kotlin.time.Instant
 
 /**
- * Append-only audit log сообщений.
+ * Append-only audit log сообщений — read-only представление.
  *
- * Только `append` и чтение. Никаких обновлений, никакого удаления
- * (кроме каскадного вместе с ConversationStore.delete).
+ * Producer-операция [MutableMessageStore.append] находится на
+ * [MutableMessageStore] — этот интерфейс только для чтения, чтобы
+ * consumer'ы физически не могли писать в audit log.
+ *
+ * Никаких обновлений, никакого удаления (кроме каскадного вместе
+ * с ConversationStore.delete).
  */
 interface MessageStore : AutoCloseable {
 
-    suspend fun append(record: MessageRecord)
-
     suspend fun list(conversationId: String, after: Instant, offset: Int, limit: Int): List<MessageRecord>
 
     suspend fun listAll(conversationId: String): List<MessageRecord>
 
+    /**
+     * Subscribe на события append'ов. Default — `emptyFlow()` для store'ов
+     * без live-уведомлений (например, SQLite без триггеров); impl'ы с
+     * in-memory notification (`:storage-inmemory`) override'ят.
+     */
     fun events(): Flow<MessageEvent> = kotlinx.coroutines.flow.emptyFlow()
 
     suspend fun tokenStats(conversationId: String): TokenStats
-}
-
+}

message-log-api/src/commonMain/kotlin/pw/binom/agentik/messageLog/MutableMessageStore.kt

@@ -0,0 +1,17 @@
+package pw.binom.agentik.messageLog
+
+/**
+ * Mutable вариант [MessageStore] — добавляет producer-операцию [append].
+ *
+ * Этот интерфейс предназначен **только для producer'ов** (ChatAgent,
+ * ConversationLoop, ToolDispatcher, sub-agents, A2A-bridge).
+ * Consumer'ы (DebugRoutes, admin dashboards, parent agents) должны
+ * принимать **read-only** [MessageStore] — тогда невозможно случайно
+ * записать в audit log из observer'а.
+ *
+ * **Append семантика**: см. KDoc [MessageStore.append][MessageStore] —
+ * на этом интерфейсе (не дублируем).
+ */
+interface MutableMessageStore : MessageStore {
+    suspend fun append(record: MessageRecord)
+}

standalone/src/jvmMain/kotlin/pw/binom/agentik/standalone/agent/ChatAgent.kt

@@ -30,7 +30,7 @@ import pw.binom.agentik.messageStore.ConversationStore
 import pw.binom.agentik.messageStore.Ids
 import pw.binom.agentik.messageStore.Reflection
 import pw.binom.agentik.messageStore.ReflectionStore
-import pw.binom.agentik.messageLog.MessageStore
+import pw.binom.agentik.messageLog.MutableMessageStore
 import pw.binom.agentik.workingMemory.WorkingMemoryStore
 import pw.binom.agentik.toolsets.DisableToolsetTool
 import pw.binom.agentik.toolsets.EnableToolsetTool
@@ -64,7 +64,7 @@ import pw.binom.litert.LiteLlm
 class ChatAgent(
     override val id: String,
     private val conversationStore: ConversationStore,
-    private val messageStore: MessageStore,
+    private val messageStore: MutableMessageStore,
     private val workingMemoryStore: WorkingMemoryStore,
     private val reflectionStore: ReflectionStore,
     private val llm: LiteLlm,

standalone/src/jvmMain/kotlin/pw/binom/agentik/standalone/agent/ConversationLoop.kt

@@ -34,7 +34,7 @@ import pw.binom.agentik.messageStore.ConversationStore
 import pw.binom.agentik.messageLog.MessageContext
 import pw.binom.agentik.messageLog.MessageOrigin
 import pw.binom.agentik.messageLog.MessageRecord
-import pw.binom.agentik.messageLog.MessageStore
+import pw.binom.agentik.messageLog.MutableMessageStore
 import pw.binom.agentik.messageStore.ReflectionStore
 import pw.binom.agentik.messageLog.TurnTokens
 import pw.binom.agentik.workingMemory.WorkingMemoryEntry
@@ -55,7 +55,7 @@ import pw.binom.agentik.toolsets.NamedTool
 class ConversationLoop(
     record: ConversationRecord,
     private val conversationStore: ConversationStore,
-    private val messageStore: MessageStore,
+    private val messageStore: MutableMessageStore,
     private val workingMemoryStore: WorkingMemoryStore,
     private val reflectionStore: ReflectionStore?,
     private val eventStore: pw.binom.agentik.eventStore.MutableEventStore,

standalone/src/jvmMain/kotlin/pw/binom/agentik/standalone/agent/ToolDispatcher.kt

@@ -6,7 +6,7 @@ import kotlinx.coroutines.async
 import mu.KotlinLogging
 import pw.binom.agentik.proto.Event as ProtoEvent
 import pw.binom.agentik.messageLog.MessageRecord
-import pw.binom.agentik.messageLog.MessageStore
+import pw.binom.agentik.messageLog.MutableMessageStore
 import pw.binom.agentik.workingMemory.WorkingMemoryEntry
 import pw.binom.agentik.toolsets.ToolsetDispatchPolicy
 import pw.binom.litert.LiteToolCall
@@ -16,7 +16,7 @@ import pw.binom.agentik.toolsets.NamedTool
 
 internal class ToolDispatcher(
     private val state: ConversationState,
-    private val messageStore: MessageStore,
+    private val messageStore: MutableMessageStore,
     private val events: ConversationEvents,
     private val backgroundEvents: BackgroundEventBus,
     private val toolsByName: MutableMap<String, NamedTool>,

storage-inmemory/src/commonMain/kotlin/pw/binom/agentik/storage/inmemory/InMemoryMessageStore.kt

@@ -7,7 +7,7 @@ import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 import pw.binom.agentik.messageLog.MessageEvent
 import pw.binom.agentik.messageLog.MessageRecord
-import pw.binom.agentik.messageLog.MessageStore
+import pw.binom.agentik.messageLog.MutableMessageStore
 import pw.binom.agentik.messageLog.TokenStats
 import kotlin.time.Instant
 
@@ -22,7 +22,7 @@ import kotlin.time.Instant
  * любом KMP-таргете (включая iOS/native, где SQLite через Android driver
  * недоступен).
  */
-class InMemoryMessageStore : MessageStore {
+class InMemoryMessageStore : MutableMessageStore {
 
     private val byConv: MutableMap<String, MutableList<MessageRecord>> = mutableMapOf()
     private val events = MutableSharedFlow<MessageEvent>(extraBufferCapacity = 64)

storage-inmemory/src/commonMain/kotlin/pw/binom/agentik/storage/inmemory/InMemoryStorage.kt

@@ -1,6 +1,6 @@
 package pw.binom.agentik.storage.inmemory
 
-import pw.binom.agentik.messageLog.MessageStore
+import pw.binom.agentik.messageLog.MutableMessageStore
 import pw.binom.agentik.messageStore.ConversationStore
 import pw.binom.agentik.messageStore.ReflectionStore
 import pw.binom.agentik.workingMemory.WorkingMemoryStore
@@ -22,7 +22,7 @@ import kotlin.time.Clock
 object InMemoryStorage {
     data class Bundle(
         val conversationStore: ConversationStore,
-        val messageStore: MessageStore,
+        val messageStore: MutableMessageStore,
         val workingMemoryStore: WorkingMemoryStore,
         val reflectionStore: ReflectionStore,
     )

storage-ksqlite/src/commonMain/kotlin/pw/binom/agentik/storage/ksqlite/KsqliteMessageStore.kt

@@ -2,7 +2,7 @@ package pw.binom.agentik.storage.ksqlite
 
 import kotlinx.serialization.json.Json
 import pw.binom.agentik.messageLog.MessageRecord
-import pw.binom.agentik.messageLog.MessageStore
+import pw.binom.agentik.messageLog.MutableMessageStore
 import pw.binom.agentik.messageLog.TokenStats
 import pw.binom.agentik.messageLog.decodeBodyPayload
 import pw.binom.agentik.messageLog.encodeBodyPayload
@@ -24,7 +24,7 @@ import kotlinx.coroutines.withContext
  */
 class KsqliteMessageStore(
     private val connection: SQLiteConnection,
-) : MessageStore {
+) : MutableMessageStore {
 
     private val mutex = Mutex()
     private val json = Json { ignoreUnknownKeys = true }

storage-ksqlite/src/commonMain/kotlin/pw/binom/agentik/storage/ksqlite/KsqliteStores.kt

@@ -1,7 +1,7 @@
 package pw.binom.agentik.storage.ksqlite
 
 import pw.binom.agentik.messageStore.ConversationStore
-import pw.binom.agentik.messageLog.MessageStore
+import pw.binom.agentik.messageLog.MutableMessageStore
 import pw.binom.agentik.messageStore.ReflectionStore
 import pw.binom.agentik.workingMemory.WorkingMemoryStore
 import pw.binom.db.ksqlite.SQLiteConnection
@@ -18,7 +18,7 @@ import pw.binom.db.ksqlite.SQLiteConnection
 class KsqliteStores private constructor(
     val connection: SQLiteConnection,
     val conversations: ConversationStore,
-    val messages: MessageStore,
+    val messages: MutableMessageStore,
     val workingMemory: WorkingMemoryStore,
     val reflections: ReflectionStore,
 ) : AutoCloseable {

storage-sqlite/src/jvmMain/kotlin/pw/binom/agentik/storage/sqlite/SqliteMessageStore.kt

@@ -2,7 +2,7 @@ package pw.binom.agentik.storage.sqlite
 
 import kotlinx.serialization.json.Json
 import pw.binom.agentik.messageLog.MessageRecord
-import pw.binom.agentik.messageLog.MessageStore
+import pw.binom.agentik.messageLog.MutableMessageStore
 import pw.binom.agentik.messageLog.TokenStats
 import pw.binom.agentik.messageLog.decodeBodyPayload
 import pw.binom.agentik.messageLog.encodeBodyPayload
@@ -19,7 +19,7 @@ import kotlin.time.Instant
  * SQLDelight сохраняет snake_case в сгенерированной data class (`Message`),
  * поэтому обращаемся через `conversation_id`, `payload_json`, `created_at`.
  */
-class SqliteMessageStore(private val db: AgentikDatabase) : MessageStore {
+class SqliteMessageStore(private val db: AgentikDatabase) : MutableMessageStore {
 
     private val q get() = db.messageQueries
 

storage-sqlite/src/jvmMain/kotlin/pw/binom/agentik/storage/sqlite/SqliteStores.kt

@@ -4,7 +4,7 @@ import app.cash.sqldelight.db.QueryResult
 import app.cash.sqldelight.db.SqlDriver
 import app.cash.sqldelight.driver.jdbc.sqlite.JdbcSqliteDriver
 import pw.binom.agentik.messageStore.ConversationStore
-import pw.binom.agentik.messageLog.MessageStore
+import pw.binom.agentik.messageLog.MutableMessageStore
 import pw.binom.agentik.messageStore.ReflectionStore
 import pw.binom.agentik.storage.sqlite.SqliteReflectionStore
 import pw.binom.agentik.workingMemory.WorkingMemoryStore
@@ -15,7 +15,7 @@ import pw.binom.agentik.workingMemory.WorkingMemoryStore
 class SqliteStores private constructor(
     val driver: SqlDriver,
     val conversations: ConversationStore,
-    val messages: MessageStore,
+    val messages: MutableMessageStore,
     val workingMemory: WorkingMemoryStore,
     val reflections: ReflectionStore,
 ) : AutoCloseable {