refactor: rename the router subsystem to Talkie

The 'router' name was misleading — it's the always-on conversational front-end
(CHAT triage + STEERING into a running workflow), not a routing layer, and it's
distinct from InferenceRouter. Rename core:router -> core:talkie, package
com.correx.core.router -> com.correx.core.talkie, and RouterFacade/Config/State/
Repository/ContextBuilder/Projector/Reducer/Response -> Talkie*. Config section
[router] -> [talkie] (legacy [router] still read as fallback).

Persisted wire formats are preserved: ChatTurnRole.ROUTER and the
RouterNarrationEvent @SerialName("RouterNarration") stay, so existing event
logs still replay. RouterNarrationEvent the class is now TalkieNarrationEvent.

testing/projections/build.gradle

@@ -12,7 +12,7 @@ dependencies {
     testImplementation(project(":core:inference"))
     testImplementation(project(":core:kernel"))
     testImplementation(project(":core:artifacts"))
-    testImplementation(project(":core:router"))
+    testImplementation(project(":core:talkie"))
     testImplementation(project(":core:journal"))
     implementation(project(":testing:fixtures"))
 }

testing/projections/src/test/kotlin/TalkieProjectorTest.kt

@@ -8,19 +8,19 @@ import com.correx.core.events.events.WorkflowFailedEvent
 import com.correx.core.events.events.WorkflowStartedEvent
 import com.correx.core.events.types.SessionId
 import com.correx.core.events.types.StageId
-import com.correx.core.router.DefaultRouterReducer
-import com.correx.core.router.RouterProjector
-import com.correx.core.router.model.StageOutcomeKind
-import com.correx.core.router.model.WorkflowStatus
+import com.correx.core.talkie.DefaultTalkieReducer
+import com.correx.core.talkie.TalkieProjector
+import com.correx.core.talkie.model.StageOutcomeKind
+import com.correx.core.talkie.model.WorkflowStatus
 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.Test
 
-class RouterProjectorTest {
+class TalkieProjectorTest {
 
-    private val reducer = DefaultRouterReducer()
-    private val projector = RouterProjector(reducer)
+    private val reducer = DefaultTalkieReducer()
+    private val projector = TalkieProjector(reducer)
     private val sessionId = SessionId("s1")
     private val stageId = StageId("stage-1")
     private val workflowId = "workflow-test"