feat: complete HomeAgent architecture v2

- IO abstraction layer with OutputChannel routing and capability validation
- Three-layer memory (Context-Document-Graph) with TF-IDF relevance pruning
- OneBot V11 QQ protocol plugin with Reverse WebSocket client
- Plugin system with hot-reload (SKILL.md + native factories)
- Knowledge system with TF-IDF vector indexing
- Personality system (personal.md)
- Text memory (JSONL with rotation)
- Change tracker (overlayfs) with rollback
- Lua adapter VM
- Design document (DESIGN.md)

Module: gitcode.com/JianFeeeee/HomeAgent

internal/tokenizer/jieba.go

@@ -0,0 +1,81 @@
+package tokenizer
+
+import (
+	"strings"
+	"sync"
+
+	jieba "github.com/yanyiwu/gojieba"
+)
+
+type Jieba struct {
+	mu     sync.Mutex
+	handle *jieba.Jieba
+}
+
+var (
+	global *Jieba
+	once   sync.Once
+)
+
+func Global() *Jieba {
+	once.Do(func() {
+		global = &Jieba{
+			handle: jieba.NewJieba(),
+		}
+	})
+	return global
+}
+
+func (j *Jieba) Close() {
+	j.mu.Lock()
+	defer j.mu.Unlock()
+	if j.handle != nil {
+		j.handle.Free()
+		j.handle = nil
+	}
+}
+
+func (j *Jieba) ExtractKeywords(text string, topK int) []string {
+	j.mu.Lock()
+	defer j.mu.Unlock()
+
+	words := j.handle.ExtractWithWeight(text, topK)
+	result := make([]string, 0, len(words))
+	seen := make(map[string]bool)
+
+	for _, w := range words {
+		if seen[w.Word] {
+			continue
+		}
+		if len([]rune(w.Word)) < 2 {
+			continue
+		}
+		seen[w.Word] = true
+		result = append(result, w.Word)
+	}
+
+	return result
+}
+
+func (j *Jieba) Cut(text string) []string {
+	j.mu.Lock()
+	defer j.mu.Unlock()
+
+	return j.handle.Cut(text, true)
+}
+
+func (j *Jieba) Tag(text string) map[string]string {
+	j.mu.Lock()
+	defer j.mu.Unlock()
+
+	words := j.handle.Tag(text)
+	result := make(map[string]string, len(words))
+	for _, pair := range words {
+		if idx := strings.Index(pair, "/"); idx > 0 {
+			result[pair[:idx]] = pair[idx+1:]
+		} else {
+			result[pair] = ""
+		}
+	}
+	return result
+}