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.

apps/server/build.gradle

@@ -38,7 +38,7 @@ dependencies {
     implementation project(':infrastructure:inference:llama_cpp')
     implementation project(':infrastructure:inference:openai_compat')
     implementation project(':infrastructure:inference:commons')
-    implementation project(':core:router')
+    implementation project(':core:talkie')
     implementation project(':core:tools')
     implementation project(':core:toolintent')
     implementation project(':infrastructure:tools')