promp and clear command

server/src/services/chatService/index.js

@@ -1,7 +1,7 @@
 // Chat Service Orchestrator
 // Purpose: Composes chat submodules into the public service API and boots socket/event wiring.
 // Scope: Keeps external chat contracts stable while delegating logic to focused modules.
-const { history } = require('./state');
+const { history, clearHistory } = require('./state');
 const { normalizeUserText } = require('./contentFilters');
 const { buildMessage, buildTypingPayload } = require('./contextBuilders');
 const { broadcastMessage, getRecentMessages } = require('./broadcast');
@@ -37,4 +37,5 @@ module.exports = {
   buildTypingPayload,
   sendSystemMessage,
   getRecentMessages,
+  clearHistory,
 };

server/src/services/chatService/state.js

@@ -40,6 +40,12 @@ function setLastAccessNoticeAt(ts) {
   lastAccessNoticeAt = ts;
 }
 
+function clearHistory() {
+  history.length = 0;
+  lastMessageBySocket.clear();
+  typingBySocket.clear();
+}
+
 module.exports = {
   rateBuckets,
   history,
@@ -50,4 +56,5 @@ module.exports = {
   getRecentMessages,
   getLastAccessNoticeAt,
   setLastAccessNoticeAt,
+  clearHistory,
 };