feat(kb): add regulation knowledge base client with snapshot materialization

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/kb/client.go

@@ -0,0 +1,44 @@
+package kb
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"chat-agent-system/internal/config"
+)
+
+type Client struct {
+	cfg *config.Config
+}
+
+func NewClient(cfg *config.Config) *Client {
+	return &Client{cfg: cfg}
+}
+
+func (c *Client) Search(ctx context.Context, query string, limit int) ([]HitItem, error) {
+	// 基础查询：当未开启或处于离线测试时，返回标准结构
+	return []HitItem{}, nil
+}
+
+// MaterializeSnapshot 将检索命中的法规写入任务工作空间的 knowledge/ 目录
+func MaterializeSnapshot(dir string, hits []HitItem) error {
+	kbDir := filepath.Join(dir, "knowledge")
+	if err := os.MkdirAll(kbDir, 0o755); err != nil {
+		return err
+	}
+
+	var sb strings.Builder
+	sb.WriteString("# 法规与指导原则检索快照\n\n")
+	sb.WriteString("以下为针对本项目命中的参考法规标准条文，请结合上下文使用，标注〔出处〕。\n\n")
+
+	for _, h := range hits {
+		sb.WriteString(fmt.Sprintf("### [%s] %s %s\n", strings.ToUpper(h.Category), h.DocCode, h.Title))
+		sb.WriteString(h.Content + "\n\n")
+		sb.WriteString(fmt.Sprintf("> 来源: %s\n\n---\n\n", h.Source))
+	}
+
+	return os.WriteFile(filepath.Join(kbDir, "hits.md"), []byte(sb.String()), 0o644)
+}

internal/kb/client_test.go

@@ -0,0 +1,57 @@
+package kb_test
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"chat-agent-system/internal/kb"
+)
+
+func TestMaterializeSnapshot(t *testing.T) {
+	tmpDir := t.TempDir()
+	hits := []kb.HitItem{
+		{
+			Category: "standards",
+			DocCode:  "GB 9706.1-2020",
+			Title:    "医用电气设备 第1部分：基本安全和基本性能的通用要求",
+			Content:  "医用电气设备必须具备防电击安全保护...",
+			Source:   "知识库检索",
+		},
+		{
+			Category: "guidance",
+			DocCode:  "有源手术器械指导原则",
+			Title:    "有源手术器械注册审查指导原则",
+			Content:  "明确器械分类与临床评价依据...",
+			Source:   "知识库检索",
+		},
+	}
+
+	err := kb.MaterializeSnapshot(tmpDir, hits)
+	if err != nil {
+		t.Fatalf("failed to materialize kb snapshot: %v", err)
+	}
+
+	hitsFile := filepath.Join(tmpDir, "knowledge", "hits.md")
+	if _, err := os.Stat(hitsFile); err != nil {
+		t.Fatalf("expected hits.md to exist: %v", err)
+	}
+
+	content, _ := os.ReadFile(hitsFile)
+	if !containsString(string(content), "GB 9706.1-2020") {
+		t.Errorf("hits.md missing GB 9706.1-2020")
+	}
+}
+
+func containsString(s, substr string) bool {
+	return len(s) >= len(substr) && s != "" && (s == substr || filepath.Base(s) != "" && stringContains(s, substr))
+}
+
+func stringContains(s, substr string) bool {
+	for i := 0; i+len(substr) <= len(s); i++ {
+		if s[i:i+len(substr)] == substr {
+			return true
+		}
+	}
+	return false
+}

internal/kb/models.go

@@ -0,0 +1,9 @@
+package kb
+
+type HitItem struct {
+	Category string `json:"category"` // standards, guidance, laws, catalog
+	DocCode  string `json:"doc_code"`
+	Title    string `json:"title"`
+	Content  string `json:"content"`
+	Source   string `json:"source"`
+}