feat(group-chat): add @all mention routing (#857)

Add modular group-chat mention routing helpers for the reserved @all token, route it to every non-sender agent, and strip routing tokens before model input.

Expose @all in mention autocomplete, highlight it in group messages, reserve literal all agent names, and cover boundary/partial-match regressions with tests.

packages/server/src/services/hermes/group-chat/agent-clients.ts

@@ -5,6 +5,11 @@ import { updateUsage } from '../../../db/hermes/usage-store'
 import { AgentBridgeClient, type AgentBridgeMessage, type AgentBridgeOutput } from '../agent-bridge'
 import { convertContentBlocksForAgent, isContentBlockArray } from '../run-chat/content-blocks'
 import type { ContentBlock } from '../run-chat/types'
+import {
+    isAllAgentsMentioned,
+    resolveMentionTargets,
+    stripMentionRoutingTokens,
+} from './mention-routing'
 
 // ─── Types ────────────────────────────────────────────────────
 
@@ -302,20 +307,20 @@ class AgentClient {
                 }
             }
 
-            // Keep the original mentions visible and add an explicit routing note.
-            // When a user mentions multiple agents, stripping only this agent's
-            // name can make the remaining input look like it was meant for
-            // someone else.
-            const routedPrefix = `群聊系统：这条消息已经提及你（${this.name}），请直接回复；即使消息同时提及其他成员，也不要因此输出空回复。`
-            const ownMentionPattern = new RegExp(`@${this.name.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')}\\s*`, 'gi')
+            // Keep routing explicit while removing only the mention tokens that
+            // selected this agent. This avoids making @all look like an
+            // instruction for the model to fan out another routing cycle.
+            const routedPrefix = isAllAgentsMentioned(msg.content)
+                ? `群聊系统：这条消息通过 @all 提及所有 agent，你是其中之一，请直接回复。`
+                : `群聊系统：这条消息已经提及你（${this.name}），请直接回复；即使消息同时提及其他成员，也不要因此输出空回复。`
             const rawInput = msg.input || msg.content
             const input = isContentBlockArray(rawInput)
                 ? rawInput.map((block) => {
                     if (block.type !== 'text') return block
-                    const text = String(block.text || msg.content).replace(ownMentionPattern, '').trim()
+                    const text = stripMentionRoutingTokens(String(block.text || msg.content), this.name)
                     return { ...block, text: `${routedPrefix}\n\n原始消息：${text || msg.content}` }
                 })
-                : `${routedPrefix}\n\n原始消息：${msg.content.replace(ownMentionPattern, '').trim() || msg.content}`
+                : `${routedPrefix}\n\n原始消息：${stripMentionRoutingTokens(msg.content, this.name) || msg.content}`
             const bridgeInput: AgentBridgeMessage = isContentBlockArray(input)
                 ? await convertContentBlocksForAgent(input)
                 : input
@@ -815,12 +820,7 @@ export class AgentClients {
      */
     async processMentions(roomId: string, msg: MentionMessage): Promise<void> {
         const agents = this.getAgents(roomId)
-        const senderName = msg.senderName.toLowerCase()
-
-        const mentioned = agents.filter(a => (
-            a.name.toLowerCase() !== senderName &&
-            isAgentMentioned(msg.content, a.name)
-        ))
+        const mentioned = resolveMentionTargets(agents, msg.content, msg.senderId)
         if (mentioned.length === 0) return
 
         logger.debug(`[AgentClients] ${mentioned.map(a => a.name).join(', ')} mentioned by ${msg.senderName}`)
@@ -886,9 +886,3 @@ export class AgentClients {
 function nextMentionDepth(msg: MentionMessage): number {
     return Math.max(0, msg.mentionDepth || 0) + 1
 }
-
-function isAgentMentioned(content: string, agentName: string): boolean {
-    const escaped = agentName.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
-    const pattern = new RegExp(`@${escaped}(?=$|\\s|[.,!?;:，。！？；：])`, 'i')
-    return pattern.test(content)
-}