refactor(cleanup-05): remove flat approval/status fields from SessionSnapshot

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

@@ -35,20 +35,8 @@ class SessionEventBridge(
                 ?.map { ApprovalDto(requestId = it.id.value, tier = it.tier.name) }
                 ?: emptyList()
 
-            val pendingRequest = approvalState?.requests?.values
-                ?.firstOrNull { req -> approvalState.decisions.values.none { it.requestId == req.id } }
-
             send(ServerMessage.SessionSnapshot(
                 sessionId = sessionId,
-                workflowId = orchState.workflowId,
-                status = orchState.status.name,
-                currentStageId = orchState.currentStageId?.value,
-                pauseReason = orchState.pauseReason,
-                pendingApproval = orchState.pendingApproval,
-                approvalRequestId = pendingRequest?.id?.value,
-                approvalTier = pendingRequest?.tier?.name,
-                approvalToolName = pendingRequest?.toolName,
-                approvalPreview = pendingRequest?.preview,
                 state = SessionStateDto(
                     status = orchState.status.name,
                     currentStageId = orchState.currentStageId?.value,

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

@@ -76,15 +76,6 @@ sealed interface ServerMessage {
     @SerialName("session_snapshot")
     data class SessionSnapshot(
         val sessionId: SessionId,
-        val workflowId: String,
-        val status: String,
-        val currentStageId: String?,
-        val pauseReason: String?,
-        val pendingApproval: Boolean,
-        val approvalRequestId: String?,
-        val approvalTier: String?,
-        val approvalToolName: String?,
-        val approvalPreview: String?,
         val state: SessionStateDto,
         val pendingApprovals: List<ApprovalDto>,
         val lastSequence: Long,

apps/server/src/test/kotlin/com/correx/apps/server/protocol/ServerMessageSerializationTest.kt

@@ -39,15 +39,6 @@ class ServerMessageSerializationTest {
     fun `SessionSnapshot encodes lastSequence and lastSessionSequence`() {
         val msg = ServerMessage.SessionSnapshot(
             sessionId = SessionId("sess-1"),
-            workflowId = "wf-1",
-            status = "running",
-            currentStageId = "stage-1",
-            pauseReason = null,
-            pendingApproval = false,
-            approvalRequestId = null,
-            approvalTier = null,
-            approvalToolName = null,
-            approvalPreview = null,
             state = SessionStateDto(
                 status = "running",
                 currentStageId = "stage-1",