fix(app): initialize checkpoint store on cold startup

internal/app/bootstrap.go

@@ -231,10 +231,13 @@ func BuildGatewayServerDeps(ctx context.Context, opts BootstrapOptions) (Runtime
 		))
 	}
 
-	// Checkpoint 基础设施：影子仓库 + SQLite checkpoint 存储
-	// 复用 sessionStore 的 *sql.DB 连接，避免 Windows 上多连接文件锁定。
+	// Checkpoint 基础设施：影子仓库 + SQLite checkpoint 存储。
+	// 优先复用 sessionStore 已打开的 *sql.DB；冷启动尚未建连时回退到同一路径的独立 store，
+	// 避免 sessionStore.DB() 为 nil 时整条 checkpoint 链路被静默跳过。
 	sessionDB := sessionStore.DB()
-	var checkpointStore *checkpoint.SQLiteCheckpointStore
+	checkpointStore := checkpoint.NewSQLiteCheckpointStore(
+		agentsession.DatabasePath(sharedDeps.ConfigManager.BaseDir(), cfg.Workdir),
+	)
 	if sessionDB != nil {
 		checkpointStore = checkpoint.NewSQLiteCheckpointStoreWithDB(sessionDB)
 	}

internal/app/bootstrap_test.go

@@ -17,6 +17,7 @@ import (
 	"testing"
 	"time"
 
+	"neo-code/internal/checkpoint"
 	"neo-code/internal/config"
 	configstate "neo-code/internal/config/state"
 	"neo-code/internal/gateway/protocol"
@@ -918,6 +919,45 @@ func TestBuildRuntimeUsesWorkdirOverride(t *testing.T) {
 	}
 }
 
+func TestBuildGatewayServerDepsInitializesCheckpointStoreOnFreshStartup(t *testing.T) {
+	disableBuiltinProviderAPIKeys(t)
+
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	t.Setenv("USERPROFILE", home)
+
+	bundle, err := BuildGatewayServerDeps(context.Background(), BootstrapOptions{})
+	if err != nil {
+		t.Fatalf("BuildGatewayServerDeps() error = %v", err)
+	}
+	if bundle.Close != nil {
+		t.Cleanup(func() {
+			if err := bundle.Close(); err != nil {
+				t.Fatalf("bundle.Close() error = %v", err)
+			}
+		})
+	}
+
+	runtimeWithCheckpoints, ok := bundle.Runtime.(interface {
+		ListCheckpoints(ctx context.Context, sessionID string, opts checkpoint.ListCheckpointOpts) ([]agentsession.CheckpointRecord, error)
+	})
+	if !ok {
+		t.Fatalf("expected runtime to expose ListCheckpoints")
+	}
+
+	records, err := runtimeWithCheckpoints.ListCheckpoints(
+		context.Background(),
+		"fresh-startup-session",
+		checkpoint.ListCheckpointOpts{},
+	)
+	if err != nil {
+		t.Fatalf("expected checkpoint store to be available on fresh startup, got %v", err)
+	}
+	if len(records) != 0 {
+		t.Fatalf("expected no checkpoints for fresh session, got %+v", records)
+	}
+}
+
 func TestBuildRuntimeSucceedsWhenSkillsRootMissing(t *testing.T) {
 	disableBuiltinProviderAPIKeys(t)