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.

core/agents/src/main/kotlin/com/correx/core/agents/Module.kt

@@ -1,3 +0,0 @@
-package com.correx.core.agents
-
-object Module

core/artifacts/src/main/kotlin/com/correx/core/artifacts/Module.kt

@@ -1,3 +0,0 @@
-package com.correx.core.artifacts
-
-object Module

core/config/src/main/kotlin/com/correx/core/config/Module.kt

@@ -1,3 +0,0 @@
-package com.correx.core.config
-
-object Module

core/config/src/test/kotlin/com/correx/core/config/ConfigLoaderTest.kt

@@ -1,8 +1,6 @@
 package com.correx.core.config
 
 import org.junit.jupiter.api.Test
-import java.nio.file.Files
-import java.nio.file.Paths
 import kotlin.test.assertEquals
 
 class ConfigLoaderTest {

core/context/src/main/kotlin/com/correx/core/context/Module.kt

@@ -1,3 +0,0 @@
-package com.correx.core.context
-
-object Module

core/observability/src/main/kotlin/com/correx/core/observability/Module.kt

@@ -1,3 +0,0 @@
-package com.correx.core.observability
-
-object Module

core/policies/src/main/kotlin/com/correx/core/policies/Module.kt

@@ -1,3 +0,0 @@
-package com.correx.core.policies
-
-object Module

core/router/src/main/kotlin/com/correx/core/router/Module.kt

@@ -1,3 +0,0 @@
-package com.correx.core.router
-
-object Module

core/stages/src/main/kotlin/com/correx/core/stages/Module.kt

@@ -1,3 +0,0 @@
-package com.correx.core.stages
-
-object Module

core/tools/src/main/kotlin/com/correx/core/tools/Module.kt

@@ -1,3 +0,0 @@
-package com.correx.core.tools
-
-object Module

core/transitions/src/main/kotlin/com/correx/core/transitions/execution/StageExecutor.kt

@@ -0,0 +1,7 @@
+package com.correx.core.transitions.execution
+
+interface StageExecutor {
+    fun execute(
+        request: StageExecutionRequest
+    ): StageExecutionResult
+}

core/transitions/src/main/kotlin/com/correx/core/transitions/policy/CyclePolicyResolver.kt

@@ -0,0 +1,12 @@
+package com.correx.core.transitions.policy
+
+class CyclePolicyResolver(
+    private val bindings: Set<CyclePolicyBinding>
+) {
+
+    fun resolve(signature: CycleSignature): CyclePolicy? {
+        return bindings
+            .firstOrNull { it.cycle == signature }
+            ?.policy
+    }
+}

core/transitions/src/main/kotlin/com/correx/core/transitions/policy/PolicyValidation.kt

@@ -0,0 +1,23 @@
+package com.correx.core.transitions.policy
+
+class PolicyValidation {
+    fun validate(
+        bindings: Set<CyclePolicyBinding>,
+        knownCycles: Set<CycleSignature>
+    ): List<String> {
+
+        val errors = mutableListOf<String>()
+
+        val bound = bindings.map { it.cycle }.toSet()
+
+        val unbound = knownCycles - bound
+
+        if (unbound.isNotEmpty()) {
+            errors += unbound.map {
+                "Cycle $it has no policy binding"
+            }
+        }
+
+        return errors
+    }
+}