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/integration/build.gradle

@@ -29,6 +29,6 @@ dependencies {
     testImplementation(project(":infrastructure:tools"))
     testImplementation(project(":infrastructure:tools:filesystem"))
     testImplementation(project(":apps:server"))
-    testImplementation(project(":core:router"))
+    testImplementation(project(":core:talkie"))
     testImplementation(project(":core:config"))
 }

testing/integration/src/test/kotlin/RepoMapReuseIntegrationTest.kt

@@ -10,7 +10,7 @@ import com.correx.core.inference.Embedder
 import com.correx.core.journal.DecisionJournalProjector
 import com.correx.core.journal.DefaultDecisionJournalReducer
 import com.correx.core.journal.DefaultDecisionJournalRepository
-import com.correx.core.router.l3.InMemoryL3MemoryStore
+import com.correx.core.talkie.l3.InMemoryL3MemoryStore
 import com.correx.core.sessions.projections.replay.DefaultEventReplayer
 import com.correx.infrastructure.persistence.InMemoryEventStore
 import kotlinx.coroutines.runBlocking