Add YouTrack pull/push sync with project settings and time tracking.

Wire manual Y menu and CLI sync for issues and work items, persist
per-project credentials, and keep local edits until an explicit push.

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

cmd/task-master/main.go

@@ -1,8 +1,10 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	"os"
+	"strings"
 
 	tea "github.com/charmbracelet/bubbletea"
 
@@ -12,6 +14,7 @@ import (
 	"task/internal/ticket"
 	"task/internal/ui"
 	"task/internal/version"
+	"task/internal/ytsync"
 )
 
 func main() {
@@ -23,6 +26,12 @@ func main() {
 		case "help", "--help", "-h":
 			printHelp()
 			return
+		case "sync":
+			if err := runSync(os.Args[2:]); err != nil {
+				fmt.Fprintf(os.Stderr, "error: %v\n", err)
+				os.Exit(1)
+			}
+			return
 		default:
 			fmt.Fprintf(os.Stderr, "unknown command: %s\n", os.Args[1])
 			printHelp()
@@ -61,17 +70,83 @@ func run() error {
 	return nil
 }
 
+func runSync(args []string) error {
+	cfg, err := config.LoadOrCreate()
+	if err != nil {
+		return fmt.Errorf("config: %w", err)
+	}
+	projectID := cfg.ActiveProject
+	action := ""
+	for i := 0; i < len(args); i++ {
+		switch args[i] {
+		case "pull", "push":
+			if action != "" {
+				return fmt.Errorf("specify only one of pull/push")
+			}
+			action = args[i]
+		case "--project", "-p":
+			if i+1 >= len(args) {
+				return fmt.Errorf("%s requires a project id", args[i])
+			}
+			i++
+			projectID = strings.TrimSpace(args[i])
+		case "--help", "-h":
+			fmt.Printf("Usage: %s sync <pull|push> [--project ID]\n", config.CliName)
+			return nil
+		default:
+			return fmt.Errorf("unknown sync argument: %s (use pull or push)", args[i])
+		}
+	}
+	if action == "" {
+		return fmt.Errorf("usage: %s sync <pull|push> [--project ID]", config.CliName)
+	}
+	if projectID == "" {
+		return fmt.Errorf("project id required")
+	}
+
+	store := ticket.NewJSONStore(cfg.DataDir)
+	timeStore := ticket.NewJSONTimeStore(cfg.DataDir)
+	projects := project.NewDirStore(cfg.DataDir)
+	if err := projects.Ensure(projectID); err != nil {
+		return err
+	}
+
+	switch action {
+	case "push":
+		res, err := ytsync.PushProject(context.Background(), projects, store, timeStore, projectID)
+		if err != nil {
+			return err
+		}
+		fmt.Printf("pushed %s: tickets +%d ~%d, time %d\n",
+			projectID, res.Created, res.Updated, res.TimePushed)
+	default:
+		res, err := ytsync.PullProject(context.Background(), projects, store, timeStore, projectID)
+		if err != nil {
+			return err
+		}
+		fmt.Printf("pulled %s: tickets +%d ~%d, time %d (%d issues)\n",
+			projectID, res.Created, res.Updated, res.TimePulled, res.Total)
+	}
+	return nil
+}
+
 func printHelp() {
 	fmt.Printf(`%s — offline-first terminal task manager
 
 Usage:
-  %s           Start the TUI
-  %s version   Print build version
-  %s help      Show this help
+  %s                      Start the TUI
+  %s sync pull [-p ID]    Pull issues from YouTrack
+  %s sync push [-p ID]    Push local changes to YouTrack
+  %s version              Print build version
+  %s help                 Show this help
 
 Env:
   TASK_MASTER_HOME      Override home for config/data (dev/demo sandbox)
   TASK_MASTER_DATA_DIR  Override data directory only
 
-`, config.CliName, config.CliName, config.CliName, config.CliName)
+YouTrack:
+  In the TUI: p → project → e to set remote URL, token, project key.
+  Then Y → Pull or Push (manual only; edits stay local until you push).
+
+`, config.CliName, config.CliName, config.CliName, config.CliName, config.CliName, config.CliName)
 }