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.

core/events/src/main/kotlin/com/correx/core/events/events/TalkieEvents.kt

@@ -53,7 +53,7 @@ data class ContextTruncatedEvent(
 
 @Serializable
 @SerialName("RouterNarration")
-data class RouterNarrationEvent(
+data class TalkieNarrationEvent(
     val sessionId: SessionId,
     val narrationId: String,
     val trigger: String,

core/events/src/main/kotlin/com/correx/core/events/serialization/Serialization.kt

@@ -20,7 +20,7 @@ import com.correx.core.events.events.ClarificationRequestedEvent
 import com.correx.core.events.events.ChatTurnEvent
 import com.correx.core.events.events.CritiqueFindingsRecordedEvent
 import com.correx.core.events.events.CritiqueOutcomeCorrelatedEvent
-import com.correx.core.events.events.RouterNarrationEvent
+import com.correx.core.events.events.TalkieNarrationEvent
 import com.correx.core.events.events.OperatorProfileBoundEvent
 import com.correx.core.events.events.ProjectProfileBoundEvent
 import com.correx.core.events.events.SessionWorkspaceBoundEvent
@@ -147,7 +147,7 @@ val eventModule = SerializersModule {
         subclass(ChatSessionStartedEvent::class)
         subclass(SessionWorkingTaskEvent::class)
         subclass(ChatTurnEvent::class)
-        subclass(RouterNarrationEvent::class)
+        subclass(TalkieNarrationEvent::class)
         subclass(SessionWorkspaceBoundEvent::class)
         subclass(OperatorProfileBoundEvent::class)
         subclass(ProjectProfileBoundEvent::class)

core/events/src/test/kotlin/com/correx/core/events/serialization/TalkieNarrationEventSerializationTest.kt

@@ -1,16 +1,16 @@
 package com.correx.core.events.serialization
 
 import com.correx.core.events.events.EventPayload
-import com.correx.core.events.events.RouterNarrationEvent
+import com.correx.core.events.events.TalkieNarrationEvent
 import com.correx.core.events.types.SessionId
 import com.correx.core.inference.TokenUsage
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertTrue
 
-class RouterNarrationEventSerializationTest {
+class TalkieNarrationEventSerializationTest {
 
-    private val sample = RouterNarrationEvent(
+    private val sample = TalkieNarrationEvent(
         sessionId = SessionId("sess-1"),
         narrationId = "narr-42",
         trigger = "stage_start",
@@ -24,6 +24,8 @@ class RouterNarrationEventSerializationTest {
     @Test
     fun `round-trips as polymorphic EventPayload`() {
         val encoded = eventJson.encodeToString(EventPayload.serializer(), sample)
+        // Wire discriminator is intentionally still "RouterNarration": the class was renamed
+        // Router->Talkie, but changing a persisted @SerialName would break replay of existing logs.
         assertTrue(encoded.contains("\"type\":\"RouterNarration\""), "SerialName must be present: $encoded")
         val decoded = eventJson.decodeFromString(EventPayload.serializer(), encoded)
         assertEquals(sample, decoded)
@@ -31,7 +33,7 @@ class RouterNarrationEventSerializationTest {
 
     @Test
     fun `round-trips with optional fields absent`() {
-        val minimal = RouterNarrationEvent(
+        val minimal = TalkieNarrationEvent(
             sessionId = SessionId("sess-2"),
             narrationId = "narr-0",
             trigger = "manual",