feat(checkpoint):增加上下文回滚功能

internal/app/bootstrap.go

@@ -10,6 +10,7 @@ import (
 
 	tea "github.com/charmbracelet/bubbletea"
 
+	"neo-code/internal/checkpoint"
 	"neo-code/internal/config"
 	configstate "neo-code/internal/config/state"
 	agentcontext "neo-code/internal/context"
@@ -230,8 +231,37 @@ 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。
+	sessionDB := sessionStore.DB()
+	var checkpointStore *checkpoint.SQLiteCheckpointStore
+	if sessionDB != nil {
+		checkpointStore = checkpoint.NewSQLiteCheckpointStoreWithDB(sessionDB)
+	}
+	if gitAvail, _ := checkpoint.CheckGitAvailability(ctx); gitAvail {
+		projectDir := agentsession.HashWorkspaceRoot(cfg.Workdir)
+		shadowDir := filepath.Join(sharedDeps.ConfigManager.BaseDir(), "projects", projectDir)
+		shadowRepo := checkpoint.NewShadowRepo(shadowDir, cfg.Workdir)
+		if err := shadowRepo.Init(ctx); err != nil {
+			log.Printf("checkpoint shadow repo init warning: %v", err)
+		} else if checkpointStore != nil {
+			runtimeSvc.SetCheckpointDependencies(checkpointStore, shadowRepo)
+		}
+	} else if checkpointStore != nil {
+		// 降级模式：git 不可用时仍可创建 session-only checkpoint
+		runtimeSvc.SetCheckpointDependencies(checkpointStore, nil)
+	}
+	// 启动时修复残留的 creating 状态 checkpoint
+	if checkpointStore != nil {
+		if repaired, err := checkpointStore.RepairCreatingCheckpoints(ctx); err != nil {
+			log.Printf("checkpoint repair warning: %v", err)
+		} else if repaired > 0 {
+			log.Printf("checkpoint repair: fixed %d stale checkpoints", repaired)
+		}
+	}
+
 	runtimeImpl := agentruntime.Runtime(runtimeSvc)
-	closeFns := []func() error{toolsCleanup, sessionStore.Close}
+	closeFns := []func() error{toolsCleanup, checkpointStore.Close, sessionStore.Close}
 
 	needCleanup = false