fix(kernel,server): remove stub compaction + log missing summary artifact

apps/server/src/main/kotlin/com/correx/apps/server/Main.kt

@@ -26,7 +26,6 @@ import com.correx.core.inference.InferenceRouter
 import com.correx.core.inference.ModelCapability
 import com.correx.core.kernel.orchestration.DefaultOrchestrationReducer
 import com.correx.core.kernel.orchestration.DefaultSessionOrchestrator
-import com.correx.core.kernel.orchestration.JournalCompactionService
 import com.correx.core.kernel.orchestration.OrchestrationConfig
 import com.correx.core.kernel.orchestration.OrchestrationProjector
 import com.correx.core.kernel.orchestration.OrchestrationRepository
@@ -240,14 +239,6 @@ fun main() {
         sandboxRoot = sandboxRoot,
         defaultSystemPromptPath = toolsConfig.defaultSystemPromptPath,
     )
-    val journalCompactionService = JournalCompactionService(
-        artifactStore = artifactStore,
-        summarize = { prompt ->
-            // TODO: wire real LLM summarizer — returns placeholder until inference is wired here
-            "Compacted journal summary (${prompt.lines().size} records)"
-        },
-        tokenThreshold = defaultOrchestrationConfig.journalCompactionTokenThreshold,
-    )
     val orchestrator = DefaultSessionOrchestrator(
         repositories = repositories,
         engines = engines,
@@ -255,7 +246,6 @@ fun main() {
         artifactStore = artifactStore,
         tokenizer = firstProvider.tokenizer,
         decisionJournalRepository = decisionJournalRepository,
-        compactionService = journalCompactionService,
     )
     val routerConfig = correxConfig.router
     val embedder = InfrastructureModule.createEmbedderFromConfig(routerConfig.embedder)

core/kernel/src/main/kotlin/com/correx/core/kernel/orchestration/SessionOrchestrator.kt

@@ -314,6 +314,10 @@ abstract class SessionOrchestrator(
         val journalState = decisionJournalRepository.getJournal(sessionId)
         val summaryText = journalState.summaryArtifactId?.let { id ->
             artifactStore.get(id)?.toString(Charsets.UTF_8)
+                ?: run {
+                    log.warn("Journal summary artifact {} not found in store — rendering without summary", id.value)
+                    null
+                }
         }
         val journalText = decisionJournalRenderer.render(journalState, summaryText)
         val journalEntries = if (journalText.isBlank()) emptyList() else listOf(