chore(cleanup): remove dead Module stubs and unused imports; restore deferred files

Deletes 21 Module.kt scaffolding objects that were never wired into any DI
registry. Removes unused imports across 8 production and 3 test files.

Restores StageExecutor, CyclePolicyResolver, PolicyValidation, and
ReplayContractTest — these are deferred features, not dead code.

testing/approvals/src/main/kotlin/com/correx/testing/approvals/Module.kt

@@ -1,3 +0,0 @@
-package com.correx.testing.approvals
-
-object Module

testing/contracts/src/testFixtures/kotlin/com/correx/testing/contracts/fixtures/projections/ReplayContractTest.kt

@@ -0,0 +1,35 @@
+package com.correx.testing.contracts.fixtures.projections
+
+import com.correx.core.events.stores.EventStore
+import com.correx.core.events.types.EventId
+import com.correx.core.events.types.SessionId
+import com.correx.core.sessions.projections.replay.EventReplayer
+import com.correx.testing.fixtures.EventFixtures.newEvent
+import kotlinx.coroutines.runBlocking
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+
+abstract class ReplayContractTest<S> {
+
+    protected abstract fun store(): EventStore
+
+    protected abstract fun replayer(
+        store: EventStore
+    ): EventReplayer<S>
+
+    @Test
+    fun `rebuild is deterministic`(): Unit = runBlocking {
+        val store = store()
+
+        repeat(50) {
+            store.append(newEvent(EventId("e$it"), SessionId("s1")))
+        }
+
+        val replayer = replayer(store)
+
+        val state1 = replayer.rebuild(SessionId("s1"))
+        val state2 = replayer.rebuild(SessionId("s1"))
+
+        assertEquals(state1, state2)
+    }
+}

testing/deterministic/src/main/kotlin/com/correx/testing/deterministic/Module.kt

@@ -1,3 +0,0 @@
-package com.correx.testing.deterministic
-
-object Module

testing/integration/src/main/kotlin/com/correx/testing/integration/Module.kt

@@ -1,3 +0,0 @@
-package com.correx.testing.integration
-
-object Module

testing/projections/src/main/kotlin/com/correx/testing/projections/Module.kt

@@ -1,3 +0,0 @@
-package com.correx.testing.projections
-
-object Module

testing/replay/src/main/kotlin/com/correx/testing/replay/Module.kt

@@ -1,3 +0,0 @@
-package com.correx.testing.replay
-
-object Module