sdk: embed non-toolchain SDK in third_party, add NoMemory/Cleaner support

- Embed sdk/, example/, meta/, go.mod from homeagent-sdk (no .git)
- Core .gitignore excludes SDK toolchain: bin/, tools/, package/
- RegisterInputChannel + ChannelDef(NoMemory, Cleaner) in SDK
- IOManager input channel registry with GetInputChannelDef
- eventloop: apply channel Cleaner/NoMemory to interrupt text
- context engine: channelDefLookup applied in textForVector
- document store: ChannelCleaner param for archive functions
- All callers/adapters updated with ChannelDef{} default

internal/memory/static_embedder.go

@@ -271,19 +271,31 @@ func (e *StaticEmbedder) tokenize(text string) []string {
 	if e.jieba == nil {
 		return nil
 	}
-	words := e.jieba.Cut(text, false)
+	tagged := e.jieba.Tag(text)
 	var result []string
 	seen := make(map[string]bool)
-	for _, w := range words {
-		w = strings.TrimSpace(w)
-		if w == "" || e.stopWords[w] || seen[w] {
+	for _, t := range tagged {
+		idx := strings.LastIndex(t, "/")
+		if idx < 0 {
 			continue
 		}
-		if utf8.RuneCountInString(w) < 2 {
+		word := t[:idx]
+		tag := t[idx+1:]
+		word = strings.TrimSpace(word)
+		if word == "" || seen[word] {
 			continue
 		}
-		seen[w] = true
-		result = append(result, w)
+		if e.stopWords[word] {
+			continue
+		}
+		if utf8.RuneCountInString(word) < 2 {
+			continue
+		}
+		if !contentPOS[tag] {
+			continue
+		}
+		seen[word] = true
+		result = append(result, word)
 	}
 	return result
 }