feat: implement phase 1 sync functionality

- Add lnk status command to show repository sync status

- Add lnk push command for smart staging, committing, and pushing

- Add lnk pull command with automatic symlink restoration

- Add comprehensive sync functionality to git and core packages

- Add 5 new integration tests for sync commands (17 total tests)

- Update README with sync workflow examples and documentation

- Support commits ahead/behind tracking relative to remote

- Implement change detection to avoid empty commits

- Add graceful error handling for missing remotes

Closes: Phase 1 sync implementation

cmd/pull.go

@@ -0,0 +1,36 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+	"github.com/yarlson/lnk/internal/core"
+)
+
+var pullCmd = &cobra.Command{
+	Use:   "pull",
+	Short: "Pull changes from remote and restore symlinks",
+	Long:  "Fetches changes from remote repository and automatically restores symlinks for all managed files.",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		lnk := core.NewLnk()
+		restored, err := lnk.Pull()
+		if err != nil {
+			return fmt.Errorf("failed to pull changes: %w", err)
+		}
+
+		if len(restored) > 0 {
+			fmt.Printf("Successfully pulled changes and restored %d symlink(s):\n", len(restored))
+			for _, file := range restored {
+				fmt.Printf("  - %s\n", file)
+			}
+		} else {
+			fmt.Println("Successfully pulled changes (no symlinks needed restoration)")
+		}
+
+		return nil
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(pullCmd)
+}