feat(kernel): inject decision journal into stage context + wire repository

testing/integration/build.gradle

@@ -13,6 +13,7 @@ dependencies {
     testImplementation(project(":core:context"))
     testImplementation(project(":core:inference"))
     testImplementation(project(":core:kernel"))
+    testImplementation(project(":core:journal"))
     testImplementation(project(":core:risk"))
     testImplementation(project(":core:tools"))
     testImplementation(project(":core:toolintent"))

testing/integration/src/test/kotlin/SessionOrchestratorIntegrationTest.kt

@@ -52,6 +52,9 @@ import com.correx.core.inference.Tokenizer
 import com.correx.core.inference.ToolCallFunction
 import com.correx.core.inference.ToolCallRequest
 import com.correx.core.kernel.orchestration.DefaultOrchestrationReducer
+import com.correx.core.journal.DecisionJournalProjector
+import com.correx.core.journal.DefaultDecisionJournalReducer
+import com.correx.core.journal.DefaultDecisionJournalRepository
 import com.correx.core.kernel.orchestration.DefaultSessionOrchestrator
 import com.correx.core.kernel.orchestration.OrchestrationConfig
 import com.correx.core.kernel.orchestration.OrchestrationProjector
@@ -124,6 +127,10 @@ class SessionOrchestratorIntegrationTest {
         DefaultEventReplayer(eventStore, ApprovalProjector(DefaultApprovalReducer())),
     )
 
+    private val decisionJournalRepository = DefaultDecisionJournalRepository(
+        DefaultEventReplayer(eventStore, DecisionJournalProjector(DefaultDecisionJournalReducer())),
+    )
+
     private val repositories = OrchestratorRepositories(
         eventStore = eventStore,
         inferenceRepository = inferenceRepository,
@@ -147,6 +154,7 @@ class SessionOrchestratorIntegrationTest {
         engines = engines,
         retryCoordinator = retryCoordinator,
         artifactStore = artifactStore,
+        decisionJournalRepository = decisionJournalRepository,
     )
 
     @Test
@@ -194,6 +202,7 @@ class SessionOrchestratorIntegrationTest {
             ),
             retryCoordinator = retryCoordinator,
             artifactStore = artifactStore,
+            decisionJournalRepository = decisionJournalRepository,
         )
         failingOrchestrator.run(sessionId, graph, config)
 
@@ -221,6 +230,7 @@ class SessionOrchestratorIntegrationTest {
             engines = engines.copy(validationPipeline = approvingPipeline),
             retryCoordinator = retryCoordinator,
             artifactStore = artifactStore,
+            decisionJournalRepository = decisionJournalRepository,
         )
 
         val runJob = launch { orchestrator.run(sessionId, graph, config) }
@@ -269,6 +279,7 @@ class SessionOrchestratorIntegrationTest {
             engines = engines.copy(validationPipeline = approvingPipeline),
             retryCoordinator = retryCoordinator,
             artifactStore = artifactStore,
+            decisionJournalRepository = decisionJournalRepository,
         )
 
         val runJob = launch { approvalOrchestrator.run(sessionId, graph, config) }
@@ -322,6 +333,7 @@ class SessionOrchestratorIntegrationTest {
             engines = engines,
             retryCoordinator = retryCoordinator,
             artifactStore = artifactStore,
+            decisionJournalRepository = decisionJournalRepository,
         )
 
         val sessionId = SessionId("s6")
@@ -364,6 +376,7 @@ class SessionOrchestratorIntegrationTest {
             engines = engines.copy(contextPackBuilder = droppingBuilder, promptResolver = PromptResolver { it }),
             retryCoordinator = retryCoordinator,
             artifactStore = artifactStore,
+            decisionJournalRepository = decisionJournalRepository,
         )
         val sessionId = SessionId("s-trunc")
         val config = OrchestrationConfig(retryPolicy = RetryPolicy(maxAttempts = 1, backoffMs = 0))
@@ -386,6 +399,7 @@ class SessionOrchestratorIntegrationTest {
             engines = engines,
             retryCoordinator = retryCoordinator,
             artifactStore = recordingStore,
+            decisionJournalRepository = decisionJournalRepository,
         )
 
         recordingOrchestrator.run(sessionId, graph, config)
@@ -480,6 +494,7 @@ class SessionOrchestratorIntegrationTest {
             engines = engines,
             retryCoordinator = retryCoordinator,
             artifactStore = artifactStore,
+            decisionJournalRepository = decisionJournalRepository,
         )
 
         livenessOrchestrator.run(sessionId, livenessGraph, config)
@@ -596,6 +611,7 @@ class SessionOrchestratorIntegrationTest {
             ),
             retryCoordinator = retryCoordinator,
             artifactStore = artifactStore,
+            decisionJournalRepository = decisionJournalRepository,
         )
 
         livenessOrchestrator.run(sessionId, livenessGraph, config)

testing/integration/src/test/kotlin/ToolCallGateTest.kt

@@ -38,6 +38,9 @@ import com.correx.core.inference.ToolCallFunction
 import com.correx.core.inference.ToolCallRequest
 import com.correx.core.inference.TokenUsage
 import com.correx.core.kernel.orchestration.DefaultOrchestrationReducer
+import com.correx.core.journal.DecisionJournalProjector
+import com.correx.core.journal.DefaultDecisionJournalReducer
+import com.correx.core.journal.DefaultDecisionJournalRepository
 import com.correx.core.kernel.orchestration.DefaultSessionOrchestrator
 import com.correx.core.kernel.orchestration.OrchestrationConfig
 import com.correx.core.kernel.orchestration.OrchestrationProjector
@@ -220,11 +223,15 @@ class ToolCallGateTest {
             workspacePolicy = policy,
         )
 
+        val decisionJournalRepository = DefaultDecisionJournalRepository(
+            DefaultEventReplayer(eventStore, DecisionJournalProjector(DefaultDecisionJournalReducer())),
+        )
         val orchestrator = DefaultSessionOrchestrator(
             repositories = repositories,
             engines = engines,
             retryCoordinator = DefaultRetryCoordinator(eventStore),
             artifactStore = artifactStore,
+            decisionJournalRepository = decisionJournalRepository,
         )
 
         return Triple(orchestrator, eventStore, provider)

testing/integration/src/test/kotlin/WorkspaceScopedToolRegistryTest.kt

@@ -31,6 +31,9 @@ import com.correx.core.inference.ToolCallFunction
 import com.correx.core.inference.ToolCallRequest
 import com.correx.core.inference.TokenUsage
 import com.correx.core.kernel.orchestration.DefaultOrchestrationReducer
+import com.correx.core.journal.DecisionJournalProjector
+import com.correx.core.journal.DefaultDecisionJournalReducer
+import com.correx.core.journal.DefaultDecisionJournalRepository
 import com.correx.core.kernel.orchestration.DefaultSessionOrchestrator
 import com.correx.core.kernel.orchestration.OrchestrationConfig
 import com.correx.core.kernel.orchestration.OrchestrationProjector
@@ -210,11 +213,15 @@ class WorkspaceScopedToolRegistryTest {
             workspaceToolRegistryProvider = workspaceProvider,
         )
 
+        val decisionJournalRepository = DefaultDecisionJournalRepository(
+            DefaultEventReplayer(eventStore, DecisionJournalProjector(DefaultDecisionJournalReducer())),
+        )
         return DefaultSessionOrchestrator(
             repositories = repositories,
             engines = engines,
             retryCoordinator = DefaultRetryCoordinator(eventStore),
             artifactStore = artifactStore,
+            decisionJournalRepository = decisionJournalRepository,
         ) to eventStore
     }
 

testing/replay/build.gradle

@@ -6,6 +6,7 @@ plugins {
 
 dependencies {
     testImplementation(project(":core:events"))
+    testImplementation(project(":core:journal"))
     testImplementation(project(":core:sessions"))
     testImplementation(project(":core:transitions"))
     testImplementation(project(":core:validation"))

testing/replay/src/test/kotlin/DecisionJournalReplayTest.kt

@@ -0,0 +1,50 @@
+import com.correx.core.events.events.EventMetadata
+import com.correx.core.events.events.NewEvent
+import com.correx.core.events.events.SteeringNoteAddedEvent
+import com.correx.core.events.events.TransitionExecutedEvent
+import com.correx.core.events.types.EventId
+import com.correx.core.events.types.SessionId
+import com.correx.core.events.types.StageId
+import com.correx.core.events.types.TransitionId
+import com.correx.core.journal.DecisionJournalProjector
+import com.correx.core.journal.DecisionJournalRenderer
+import com.correx.core.journal.DefaultDecisionJournalReducer
+import com.correx.core.journal.DefaultDecisionJournalRepository
+import com.correx.core.sessions.projections.replay.DefaultEventReplayer
+import com.correx.infrastructure.persistence.InMemoryEventStore
+import kotlinx.coroutines.runBlocking
+import kotlinx.datetime.Clock
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+
+class DecisionJournalReplayTest {
+
+    private fun meta(sessionId: SessionId, id: String) =
+        EventMetadata(EventId(id), sessionId, Clock.System.now(), 1, null, null)
+
+    @Test
+    fun `journal replay is deterministic`(): Unit = runBlocking {
+        val sessionId = SessionId("s")
+        val store = InMemoryEventStore()
+        store.append(NewEvent(meta(sessionId, "steer"), SteeringNoteAddedEvent(sessionId, "use jwt")))
+        store.append(
+            NewEvent(
+                meta(sessionId, "trans"),
+                TransitionExecutedEvent(sessionId, StageId("a"), StageId("b"), TransitionId("t")),
+            ),
+        )
+
+        val repo = DefaultDecisionJournalRepository(
+            DefaultEventReplayer(store, DecisionJournalProjector(DefaultDecisionJournalReducer())),
+        )
+        val renderer = DecisionJournalRenderer()
+
+        val a = renderer.render(repo.getJournal(sessionId))
+        val b = renderer.render(repo.getJournal(sessionId))
+
+        assertEquals(a, b)
+        assertTrue(a.contains("use jwt"))
+        assertTrue(a.contains("a → b"))
+    }
+}