feat(events): EventStore + AllEvent unified stream + replay endpoints

EventStore (persistent event log) и AllEvent (sealed wrapper для
третьего типа подписки — ВСЕ events в одном потоке). Touches 7 modules.

Архитектура:
  Producer (ChatAgent + ConversationEvents) → EventStore + SharedFlow
  ↓                                            ↓
  Live SSE (cold, no replay)         Replay endpoints (cursor-based)

(1) :storage-core — EventStore interface
  - append(record): idempotent по record.id (INSERT OR IGNORE)
  - query(conversationId?, afterId?, limit): пагинированный catchup
  - pruneOlderThan(instant): TTL cleanup
  - count(): maintenance метрика
  - @Serializable EventRecord(id, conversationId?, createdAt, type, payload)
  - enum EventType: AGENT_*/CONVERSATION_* (forward-compat fallback)
  - StorageBundle дополнен eventStore: EventStore? = null (backward-compat)

(2) :storage-inmemory — InMemoryEventStore
  - Thread-safe (Mutex), binarySearch для упорядоченной вставки
  - Записи сортируются по createdAt ASC, ties по id ASC (стабильно)
  - Idempotency по id (повторный append no-op)

(3) :storage-sqlite — SqliteEventStore
  - sqldelight schema: agent_event (id PK, conversation_id?, created_at,
    type, payload BLOB) + 2 индекса (conversation_id+created_at,
    created_at)
  - Миграция v3: CREATE TABLE IF NOT EXISTS (additive)
  - 5 запросов: insert, queryGlobal, queryByConv, pruneOlderThan, count
  - Forward-compat: неизвестный EventType в БД → fallback AGENT_CREATED
    (чтобы старые клиенты не падали на новых enum values)
  - Добавлен в SqliteStores (open/inMemory + asBundle())

(4) :standalone — Producer wiring
  - ChatAgent.persistAgentEvent() — fire-and-forget append при каждом
    AgentEvent (Created/Deleted/Renamed)
  - ConversationEvents — персистит в EventStore при каждом tryEmit/emit
    (концертный случай от connect disconnect)
  - ChatAgent.allEvents() — merge agent-events + snapshot всех живых
    диалогов в единый Flow<AllEvent>

(5) :proto — AllEvent sealed interface
  - AllEvent.Agent(date, event: AgentEvent)
  - AllEvent.Conversation(date, conversationId, event: Event)
  - Agent.allEvents(after): Flow<AllEvent> — третий тип подписки
    (в дополнение к events() и Conversation.events)

(6) :server — Endpoints
  - GET /events/all — SSE поток AllEvent (cold)
  - GET /events/replay?after_id=&limit= — пагинированный catchup
    (503 если EventStore не сконфигурирован)
  - GET /conversations/{id}/events/replay?after_id=&limit= — то же per-conv
  - Module.kt принимает eventStore: EventStore? параметром

(7) :client — Client API
  - AgentClient.allEvents(after) — подписка на /events/all SSE
  - AgentClient.replayAllEvents(afterId, limit) — catchup /events/replay
  - AgentClient.replayConversationEvents(convId, afterId, limit)
  - EventRecordDto — wire-зеркало EventRecord (клиент не зависит
    от :storage-core, определяет DTO локально; формат совместим с
    серверным JSON)

Тесты: 22 новых теста (12 InMemory + 10 Sqlite), все зелёные.
Все три слоя синхронизированы: proto contract + standalone impl +
server endpoint + client API.

proto/src/commonMain/kotlin/pw/binom/agentik/proto/Agent.kt

@@ -49,6 +49,18 @@ public interface Agent {
      */
     fun events(after: Instant): Flow<AgentEvent>
 
+    /**
+     * All events in one stream: agent lifecycle (Created/Deleted/Renamed) +
+     * all conversation turns. Useful for admin dashboards, debug tools,
+     * parent agents.
+     *
+     * For UI use [events] + [Conversation.events]. This one-feed variant is
+     * for cases where everything-in-one is preferred.
+     *
+     * Cold (no replay). For catchup use EventStore.
+     */
+    fun allEvents(after: Instant): Flow<AllEvent>
+
     companion object {
 
         const val PAGE_SIZE: Int = 100

proto/src/commonMain/kotlin/pw/binom/agentik/proto/AllEvent.kt

@@ -0,0 +1,39 @@
+package pw.binom.agentik.proto
+
+import kotlin.time.Instant
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+/**
+ * Unified wrapper for all agent events in a single stream.
+ *
+ * Useful for admin dashboards, debug tools, parent agents: one subscription
+ * instead of N+1. For regular UI use two separate SSE feeds
+ * ([AgentEvent] via /events and [Event] via /conversations/{id}/events);
+ * [AllEvent] is for those who need everything in one place.
+ *
+ * Server endpoint: GET /events/all (SSE), or replay via EventStore.
+ *
+ * Not used for persistence payload: EventStore stores AgentEvent and
+ * Conversation.Event natively (compact form); this wrapper is wire-format
+ * only.
+ */
+@Serializable
+sealed interface AllEvent {
+    val date: Instant
+
+    @Serializable
+    @SerialName("agent")
+    data class Agent(
+        override val date: Instant,
+        val event: AgentEvent,
+    ) : AllEvent
+
+    @Serializable
+    @SerialName("conversation")
+    data class Conversation(
+        override val date: Instant,
+        val conversationId: String,
+        val event: Event,
+    ) : AllEvent
+}