feat(kernel): retried stages receive explicit failure feedback; default retry backoff 1s

testing/contracts/src/test/kotlin/com/correx/testing/contracts/model/orchestration/RetryPolicyTest.kt

@@ -28,9 +28,9 @@ class RetryPolicyTest {
     }
 
     @Test
-    fun `backoffMs defaults to zero`() {
+    fun `backoffMs defaults to one second`() {
         val policy = RetryPolicy(maxAttempts = 1)
-        assertEquals(0L, policy.backoffMs)
+        assertEquals(1_000L, policy.backoffMs)
     }
 
     @Test

testing/kernel/src/test/kotlin/ContextFeedbackTest.kt

@@ -1,13 +1,47 @@
 import com.correx.core.context.model.ContextLayer
 import com.correx.core.context.model.EntryRole
+import com.correx.core.events.events.RetryAttemptedEvent
+import com.correx.core.events.types.SessionId
+import com.correx.core.events.types.StageId
 import com.correx.core.kernel.orchestration.buildProjectProfileEntry
+import com.correx.core.kernel.orchestration.buildRetryFeedbackEntry
 import com.correx.core.sessions.BoundProjectProfile
+import com.correx.testing.fixtures.EventFixtures.stored
 import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNull
 import org.junit.jupiter.api.Assertions.assertTrue
 import org.junit.jupiter.api.Test
 
 class ContextFeedbackTest {
 
+    @Test
+    fun `no retry events yields null`() {
+        assertNull(buildRetryFeedbackEntry(emptyList(), StageId("impl")))
+    }
+
+    @Test
+    fun `latest retry event for the stage becomes a labeled L1 system entry`() {
+        val events = listOf(
+            stored(payload = RetryAttemptedEvent(SessionId("s"), StageId("impl"), 1, 3, "old reason")),
+            stored(payload = RetryAttemptedEvent(SessionId("s"), StageId("other"), 1, 3, "other stage")),
+            stored(payload = RetryAttemptedEvent(SessionId("s"), StageId("impl"), 2, 3, "tests failed: NPE in FooTest")),
+        )
+        val entry = buildRetryFeedbackEntry(events, StageId("impl"))!!
+        assertEquals("retryFeedback", entry.sourceType)
+        assertEquals(ContextLayer.L1, entry.layer)
+        assertEquals(EntryRole.SYSTEM, entry.role)
+        assertTrue(entry.content.contains("Attempt 2 of 3"), "content: ${entry.content}")
+        assertTrue(entry.content.contains("tests failed: NPE in FooTest"), "content: ${entry.content}")
+    }
+
+    @Test
+    fun `retry entry for other stage is not returned for queried stage`() {
+        val events = listOf(
+            stored(payload = RetryAttemptedEvent(SessionId("s"), StageId("other"), 1, 3, "reason")),
+        )
+        assertNull(buildRetryFeedbackEntry(events, StageId("impl")))
+    }
+
     @Test
     fun `project profile renders as single L0 entry`() {
         val entry = buildProjectProfileEntry(