fix: wire routerConnected flag, expandable diffs, stage in session list, ArtifactCreated mapping

apps/server/src/main/kotlin/com/correx/apps/server/bridge/DomainEventMapper.kt

@@ -5,6 +5,7 @@ import com.correx.apps.server.protocol.RiskSummaryDto
 import com.correx.apps.server.protocol.ServerMessage
 import com.correx.core.artifactstore.ArtifactStore
 import com.correx.core.events.events.ApprovalRequestedEvent
+import com.correx.core.events.events.ArtifactCreatedEvent
 import com.correx.core.events.events.ChatSessionStartedEvent
 import com.correx.core.events.events.InferenceCompletedEvent
 import com.correx.core.events.events.WorkflowStartedEvent
@@ -157,6 +158,13 @@ suspend fun domainEventToServerMessage(
         )
 
         is ApprovalRequestedEvent -> mapApprovalRequested(p, seq, sessionSequence)
+        is ArtifactCreatedEvent -> ServerMessage.ArtifactCreated(
+            sessionId = p.sessionId,
+            stageId = p.stageId,
+            artifactId = p.artifactId,
+            sequence = seq,
+            sessionSequence = sessionSequence,
+        )
         else -> {
             log.debug(
                 "DomainEventMapper: unmapped payload type={} sessionId={} sequence={}",

apps/server/src/main/kotlin/com/correx/apps/server/bridge/SessionEventBridge.kt

@@ -19,6 +19,7 @@ import com.correx.core.events.events.InferenceStartedEvent
 import com.correx.core.events.events.InferenceTimeoutEvent
 import com.correx.core.events.events.NewEvent
 import com.correx.core.events.events.ApprovalRequestedEvent
+import com.correx.core.events.events.ArtifactCreatedEvent
 import com.correx.core.events.events.OrchestrationPausedEvent
 import com.correx.core.events.events.OrchestrationResumedEvent
 import com.correx.core.events.events.StageCompletedEvent
@@ -183,6 +184,7 @@ class SessionEventBridge(
             is OrchestrationPausedEvent -> EventEntryDto(ts, "SessionPaused", p.reason)
             is WorkflowCompletedEvent -> EventEntryDto(ts, "SessionCompleted", "")
             is WorkflowFailedEvent -> EventEntryDto(ts, "SessionFailed", p.reason)
+            is ArtifactCreatedEvent -> EventEntryDto(ts, "ArtifactCreated", p.artifactId.value)
             else -> null
         }
     }

apps/server/src/main/kotlin/com/correx/apps/server/protocol/ServerMessage.kt

@@ -2,6 +2,7 @@ package com.correx.apps.server.protocol
 
 import com.correx.core.approvals.Tier
 import com.correx.core.events.types.ApprovalRequestId
+import com.correx.core.events.types.ArtifactId
 import com.correx.core.events.types.SessionId
 import com.correx.core.events.types.StageId
 import kotlinx.serialization.SerialName
@@ -251,6 +252,18 @@ sealed interface ServerMessage {
         override val sessionSequence: Long? = null,
     ) : ServerMessage, NonEventMessage
 
+    // -- Artifacts --
+
+    @Serializable
+    @SerialName("artifact.created")
+    data class ArtifactCreated(
+        val sessionId: SessionId,
+        val stageId: StageId,
+        val artifactId: ArtifactId,
+        override val sequence: Long,
+        override val sessionSequence: Long,
+    ) : ServerMessage, SessionMessage
+
     // -- Router --
 
     @Serializable