feat: implement ZCLAW Agent Intelligence Evolution Phase 1-3

Phase 1: Persistent Memory + Identity Dynamic Evolution
- agent-memory.ts: MemoryManager with localStorage persistence, keyword search, deduplication, importance scoring, pruning, markdown export
- agent-identity.ts: AgentIdentityManager with per-agent SOUL/AGENTS/USER.md, change proposals with approval workflow, snapshot rollback
- memory-extractor.ts: Rule-based conversation memory extraction (Phase 1), LLM extraction prompt ready for Phase 2
- MemoryPanel.tsx: Memory browsing UI with search, type filter, delete, export (integrated as 4th tab in RightPanel)

Phase 2: Context Governance
- context-compactor.ts: Token estimation, threshold monitoring (soft/hard), memory flush before compaction, rule-based summarization
- chatStore integration: auto-compact when approaching token limits

Phase 3: Proactive Intelligence + Self-Reflection
- heartbeat-engine.ts: Periodic checks (pending tasks, memory health, idle greeting), quiet hours, proactivity levels (silent/light/standard/autonomous)
- reflection-engine.ts: Pattern analysis from memory corpus, improvement suggestions, identity change proposals, meta-memory creation

Chat Flow Integration (chatStore.ts):
- Pre-send: context compaction check -> memory search -> identity system prompt injection
- Post-complete: async memory extraction -> reflection conversation tracking -> auto-trigger reflection

Tests: 274 passing across 12 test files
- agent-memory.test.ts: 42 tests
- context-compactor.test.ts: 23 tests
- heartbeat-reflection.test.ts: 28 tests
- chatStore.test.ts: 11 tests (no regressions)

Refs: ZCLAW_AGENT_INTELLIGENCE_EVOLUTION.md updated with implementation progress

desktop/src/components/RightPanel.tsx

@@ -5,8 +5,9 @@ import { useGatewayStore, type PluginStatus } from '../store/gatewayStore';
 import { toChatAgent, useChatStore } from '../store/chatStore';
 import {
   Wifi, WifiOff, Bot, BarChart3, Plug, RefreshCw,
-  MessageSquare, Cpu, FileText, User, Activity, FileCode
+  MessageSquare, Cpu, FileText, User, Activity, FileCode, Brain
 } from 'lucide-react';
+import { MemoryPanel } from './MemoryPanel';
 import { cardHover, defaultTransition } from '../lib/animations';
 import { Button, Badge, EmptyState } from './ui';
 
@@ -16,7 +17,7 @@ export function RightPanel() {
     connect, loadClones, loadUsageStats, loadPluginStatus, workspaceInfo, quickConfig, updateClone,
   } = useGatewayStore();
   const { messages, currentModel, currentAgent, setCurrentAgent } = useChatStore();
-  const [activeTab, setActiveTab] = useState<'status' | 'files' | 'agent'>('status');
+  const [activeTab, setActiveTab] = useState<'status' | 'files' | 'agent' | 'memory'>('status');
   const [isEditingAgent, setIsEditingAgent] = useState(false);
   const [agentDraft, setAgentDraft] = useState<AgentDraft | null>(null);
 
@@ -139,11 +140,25 @@ export function RightPanel() {
           >
             <User className="w-4 h-4" />
           </Button>
+          <Button
+            variant={activeTab === 'memory' ? 'secondary' : 'ghost'}
+            size="sm"
+            onClick={() => setActiveTab('memory')}
+            className="flex items-center gap-1 text-xs px-2 py-1"
+            title="Memory"
+            aria-label="Memory"
+            aria-selected={activeTab === 'memory'}
+            role="tab"
+          >
+            <Brain className="w-4 h-4" />
+          </Button>
         </div>
       </div>
 
       <div className="flex-1 overflow-y-auto custom-scrollbar p-4 space-y-4">
-        {activeTab === 'agent' ? (
+        {activeTab === 'memory' ? (
+          <MemoryPanel />
+        ) : activeTab === 'agent' ? (
           <div className="space-y-4">
             <motion.div
               whileHover={cardHover}