feat: Phase 1+2 架构进化 — 连续思考链/主动消息决策/情感状态机/离线自主思考 (86文件)

Phase 1 (基础设施):
- ThinkChain 思考链连续性 + 差异化思考提示词 (persistent)
- AutonomousToolPolicy 工具安全策略 (safe/unsafe/conditional)
- MessageScheduler 自适应消息节奏 (Idle/Available/Busy)
- SessionEnrichmentStore 渐进式上下文丰富 (5层)
- ConversationBus 事件总线 + ResponseCache (dedup)
- pkg/logger 统一日志 + 所有 handler 替换 fmt.Printf
- NPE 守卫/链路优化/数据库表修复/Go workspace

Phase 2 (人格交互):
- EmotionState/EmotionTracker 情感状态机 (5种心情, 情绪衰减)
- ProactiveGuard 主动消息多维决策 (静默时段/紧急度/频率/校验)
- Gateway↔ai-core 在线状态感知链路 (presence notification)
- 离线思考频率控制 + 重连问候 + 离线消息排队

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/ai-core/internal/bus/conversation_bus.go

@@ -0,0 +1,101 @@
+package bus
+
+import (
+	"github.com/yourname/cyrene-ai/pkg/logger"
+	"sync"
+	"time"
+)
+
+// Bus 总线接口（方便测试和替换）
+type Bus interface {
+	Publish(event BusEvent)
+	Subscribe(eventType EventType, handler EventHandler) *Subscription
+}
+
+// ConversationBus 对话事件总线
+// Step 1: 仅 side-channel 发布，无消费端
+type ConversationBus struct {
+	mu          sync.RWMutex
+	subscribers map[EventType][]*Subscription
+	eventCh     chan BusEvent
+	done        chan struct{}
+}
+
+// NewConversationBus 创建总线
+func NewConversationBus() *ConversationBus {
+	b := &ConversationBus{
+		subscribers: make(map[EventType][]*Subscription),
+		eventCh:     make(chan BusEvent, 64),
+		done:        make(chan struct{}),
+	}
+	go b.dispatchLoop()
+	return b
+}
+
+// Publish 发布事件到总线（非阻塞）
+func (b *ConversationBus) Publish(event BusEvent) {
+	if event.Timestamp.IsZero() {
+		event.Timestamp = time.Now()
+	}
+	select {
+	case b.eventCh <- event:
+	default:
+		logger.Printf("[bus] 事件通道已满，丢弃事件: type=%s session=%s", event.Type, event.SessionID)
+	}
+}
+
+// Subscribe 订阅事件类型
+func (b *ConversationBus) Subscribe(eventType EventType, handler EventHandler) *Subscription {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	sub := &Subscription{bus: b, eventType: eventType, handler: handler}
+	b.subscribers[eventType] = append(b.subscribers[eventType], sub)
+	return sub
+}
+
+// unsubscribe 内部取消订阅
+func (b *ConversationBus) unsubscribe(sub *Subscription) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	subs := b.subscribers[sub.eventType]
+	for i, s := range subs {
+		if s == sub {
+			b.subscribers[sub.eventType] = append(subs[:i], subs[i+1:]...)
+			break
+		}
+	}
+}
+
+// Stop 停止总线
+func (b *ConversationBus) Stop() {
+	close(b.done)
+}
+
+// dispatchLoop 后台分发循环
+func (b *ConversationBus) dispatchLoop() {
+	for {
+		select {
+		case event := <-b.eventCh:
+			b.mu.RLock()
+			subs := b.subscribers[event.Type]
+			// 拷贝一份避免持锁回调
+			handlers := make([]EventHandler, len(subs))
+			for i, s := range subs {
+				handlers[i] = s.handler
+			}
+			b.mu.RUnlock()
+			for _, h := range handlers {
+				func() {
+					defer func() {
+						if r := recover(); r != nil {
+							logger.Printf("[bus] handler panic: %v", r)
+						}
+					}()
+					h(event)
+				}()
+			}
+		case <-b.done:
+			return
+		}
+	}
+}