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/talkie/build.gradle

@@ -0,0 +1,18 @@
+plugins {
+    id 'java-library'
+    id 'org.jetbrains.kotlin.jvm'
+    id 'org.jetbrains.kotlin.plugin.serialization'
+    id "org.jetbrains.kotlinx.kover"
+}
+
+dependencies {
+    implementation project(':core:events')
+    implementation project(':core:context')
+    implementation project(':core:inference')
+    implementation project(':core:sessions')
+    implementation "org.slf4j:slf4j-api:2.0.16"
+}
+
+tasks.named("koverVerify").configure {
+    enabled = false
+}