feat: multi-language embedding with CleanTemplateText + three-branch vector strategy

- StaticEmbedder: pre-trained ConceptNet Numberbatch/fastText word embeddings,
  auto-download with TF-IDF fallback, comma-separated multi-model paths
- CleanTemplateText: regex stripping of QQ tool call templates and noise
- textForVector: per-source vector strategy (agent→Response, user→Input,
  cold_storage→both)
- Indexer.BuildContext and ExtractKeywords now clean input before vectorization
- Protect recent 10 events in Prune (regression fix: use local var not const)

internal/agent/core/context_test.go

@@ -1,12 +1,19 @@
 package core
 
 import (
+	"os"
 	"testing"
 	"time"
+
+	"gitcode.com/JianFeeeee/HomeAgent/internal/memory"
 )
 
+func newTestCtx() *RelevanceContext {
+	return NewRelevanceContext("", memory.NewStaticEmbedder(""))
+}
+
 func TestContextAppendAndLen(t *testing.T) {
-	ctx := NewRelevanceContext("")
+	ctx := newTestCtx()
 	if ctx.Len() != 0 {
 		t.Errorf("new context should be empty, got %d", ctx.Len())
 	}
@@ -18,7 +25,7 @@ func TestContextAppendAndLen(t *testing.T) {
 }
 
 func TestContextRecent(t *testing.T) {
-	ctx := NewRelevanceContext("")
+	ctx := newTestCtx()
 	ctx.Append(ContextEvent{Timestamp: time.Now(), Source: "user", Input: "a"})
 	ctx.Append(ContextEvent{Timestamp: time.Now(), Source: "user", Input: "b"})
 	ctx.Append(ContextEvent{Timestamp: time.Now(), Source: "user", Input: "c"})
@@ -33,7 +40,7 @@ func TestContextRecent(t *testing.T) {
 }
 
 func TestContextFormat(t *testing.T) {
-	ctx := NewRelevanceContext("")
+	ctx := newTestCtx()
 	f := ctx.Format()
 	if f != "" {
 		t.Errorf("empty context should format to empty string, got %q", f)
@@ -54,7 +61,7 @@ func TestContextFormat(t *testing.T) {
 }
 
 func TestContextPruneKeepsTopK(t *testing.T) {
-	ctx := NewRelevanceContext("")
+	ctx := newTestCtx()
 	for i := 0; i < 20; i++ {
 		ctx.Append(ContextEvent{
 			Timestamp: time.Now(),
@@ -63,7 +70,6 @@ func TestContextPruneKeepsTopK(t *testing.T) {
 			Response:  "是的天气不错",
 		})
 	}
-	// 加一条不同主题的
 	ctx.Append(ContextEvent{
 		Timestamp: time.Now(),
 		Source:    "user",
@@ -71,17 +77,16 @@ func TestContextPruneKeepsTopK(t *testing.T) {
 		Response:  "好的我来算",
 	})
 
-	archived := ctx.Prune("微积分", 5, nil) // nil docStore → 不归档，只裁剪
+	archived := ctx.Prune("微积分", 5, nil)
 	_ = archived
 
-	// protectCount=10 + topK=5 → 最多保留 15
 	if ctx.Len() > 15 {
 		t.Errorf("after prune to 5, len should be ≤15, got %d", ctx.Len())
 	}
 }
 
 func TestContextPruneWithDocStore(t *testing.T) {
-	ctx := NewRelevanceContext("")
+	ctx := newTestCtx()
 	for i := 0; i < 15; i++ {
 		ctx.Append(ContextEvent{
 			Timestamp: time.Now(),
@@ -98,8 +103,7 @@ func TestContextPruneWithDocStore(t *testing.T) {
 }
 
 func TestContextAppendAfterPrune(t *testing.T) {
-	ctx := NewRelevanceContext("")
-	// 需要超过 protectCount(10) + topK(3) 个事件才能产生修剪候选
+	ctx := newTestCtx()
 	for i := 0; i < 20; i++ {
 		ctx.Append(ContextEvent{
 			Timestamp: time.Now(),
@@ -109,7 +113,7 @@ func TestContextAppendAfterPrune(t *testing.T) {
 	}
 
 	ctx.Prune("hello", 3, nil)
-	if ctx.Len() > 13 { // 10 protected + 3 topK
+	if ctx.Len() > 13 {
 		t.Errorf("expected ≤13 after prune, got %d", ctx.Len())
 	}
 
@@ -119,6 +123,107 @@ func TestContextAppendAfterPrune(t *testing.T) {
 	}
 }
 
+func TestContextPruneWithStaticEmbedder(t *testing.T) {
+	tmpFile, err := os.CreateTemp("", "test_embeddings_*.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.Remove(tmpFile.Name())
+
+	content := `8 4
+天气 0.1 0.2 0.3 0.4
+下雨 0.15 0.25 0.35 0.45
+台风 0.12 0.22 0.32 0.42
+股票 0.9 0.1 0.1 0.1
+基金 0.85 0.15 0.1 0.1
+微积分 0.1 0.1 0.9 0.1
+导数 0.15 0.1 0.85 0.15
+数学 0.1 0.1 0.8 0.2
+`
+	if _, err := tmpFile.WriteString(content); err != nil {
+		t.Fatal(err)
+	}
+	tmpFile.Close()
+
+	embedder := memory.NewStaticEmbedder(tmpFile.Name())
+	if !embedder.Loaded() {
+		t.Fatal("embedder should be loaded")
+	}
+
+	ctx := NewRelevanceContext("", embedder)
+
+	ctx.Append(ContextEvent{Timestamp: time.Now(), Source: "user", Input: "今天天气很好", Response: "是的"})
+	ctx.Append(ContextEvent{Timestamp: time.Now(), Source: "user", Input: "会不会下雨", Response: "会"})
+	ctx.Append(ContextEvent{Timestamp: time.Now(), Source: "user", Input: "台风来了", Response: "注意"})
+	ctx.Append(ContextEvent{Timestamp: time.Now(), Source: "user", Input: "帮我算微积分", Response: "好的"})
+	ctx.Append(ContextEvent{Timestamp: time.Now(), Source: "user", Input: "导数怎么求", Response: "公式"})
+	ctx.Append(ContextEvent{Timestamp: time.Now(), Source: "user", Input: "数学题", Response: "解答"})
+	ctx.Append(ContextEvent{Timestamp: time.Now(), Source: "user", Input: "股票涨了", Response: "恭喜"})
+	ctx.Append(ContextEvent{Timestamp: time.Now(), Source: "user", Input: "基金定投", Response: "可以"})
+
+	if ctx.Len() != 8 {
+		t.Fatalf("expected 8 events, got %d", ctx.Len())
+	}
+
+	archived := ctx.Prune("最近基金怎么样", 3, nil)
+
+	if ctx.Len() > 13 {
+		t.Errorf("prune should limit total events, got %d", ctx.Len())
+	}
+
+	remaining := ctx.Format()
+	t.Logf("query: 最近基金怎么样\nremaining events:\n%s", remaining)
+	t.Logf("archived: %d", archived)
+
+	needsFund := contains(remaining, "基金定投") || contains(remaining, "股票涨了")
+	needsWeather := contains(remaining, "今天天气很好") || contains(remaining, "台风来了")
+
+	t.Logf("has financial events: %v, has weather events: %v", needsFund, needsWeather)
+}
+
+func TestContextPruneRecent10Protected(t *testing.T) {
+	ctx := newTestCtx()
+
+	for i := 0; i < 15; i++ {
+		ctx.Append(ContextEvent{
+			Timestamp: time.Now(),
+			Source:    "user",
+			Input:     "今天天气很好",
+		})
+	}
+
+	for i := 0; i < 5; i++ {
+		ctx.Append(ContextEvent{
+			Timestamp: time.Now(),
+			Source:    "user",
+			Input:     "股票行情",
+		})
+	}
+
+	ctx.Prune("天气", 3, nil)
+
+	// 最近 10 条全部是"股票行情"（第6-15条是天气，第16-20条是股票）
+	// protectCount=10 保护最近 10 条 → 5 条天气最多保留 5+3=8 条
+	// 至少最近 10 条全部保留 → 至少包含 5 条股票
+	remaining := ctx.Format()
+	t.Logf("after weather query:\n%s", remaining)
+	weatherCount := 0
+	stockCount := 0
+	for _, line := range splitLines(remaining) {
+		if contains(line, "天气") {
+			weatherCount++
+		}
+		if contains(line, "股票") {
+			stockCount++
+		}
+	}
+	t.Logf("weather events: %d, stock events: %d", weatherCount, stockCount)
+
+	if stockCount < 5 {
+		t.Errorf("recent 10 should all be protected, expected at least 5 stock events, got %d", stockCount)
+	}
+}
+
 func contains(s, substr string) bool {
 	return len(s) >= len(substr) && containsStr(s, substr)
 }
@@ -131,3 +236,18 @@ func containsStr(s, substr string) bool {
 	}
 	return false
 }
+
+func splitLines(s string) []string {
+	var lines []string
+	start := 0
+	for i := 0; i < len(s); i++ {
+		if s[i] == '\n' {
+			lines = append(lines, s[start:i])
+			start = i + 1
+		}
+	}
+	if start < len(s) {
+		lines = append(lines, s[start:])
+	}
+	return lines
+}