feat(v0.5): show launch_dir fields in ctask info output

For project workspaces with launch_dir set, info prints three extra
lines after Path: Launch dir, Launch path, and Dir exists (yes/no
from a direct os.Stat of the intended path). Tasks and pre-v0.5
projects still omit these lines.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cmd/info.go

@@ -3,6 +3,7 @@ package cmd
 import (
 	"fmt"
 	"os"
+	"path/filepath"
 
 	"github.com/spf13/cobra"
 	"github.com/warrenronsiek/ctask/internal/config"
@@ -38,6 +39,22 @@ func runInfo(cmd *cobra.Command, args []string) error {
 	fmt.Printf("Updated:   %s\n", m.UpdatedAt.Format("2006-01-02 15:04:05"))
 	fmt.Printf("Path:      %s\n", ws.Path)
 
+	if m.LaunchDir != "" {
+		// Per spec amendment: stat the expected path directly instead of
+		// inferring existence from ResolveLaunch's fallback behavior. info
+		// is a display command, not a launch command — a permission error
+		// here is the same user-facing outcome as "not a directory", so
+		// we just report whether the stat succeeded with a directory.
+		launchAbs := filepath.Join(ws.Path, m.LaunchDir)
+		dirExists := "no"
+		if info, err := os.Stat(launchAbs); err == nil && info.IsDir() {
+			dirExists = "yes"
+		}
+		fmt.Printf("Launch dir: %s/\n", m.LaunchDir)
+		fmt.Printf("Launch path: %s\n", launchAbs)
+		fmt.Printf("Dir exists: %s\n", dirExists)
+	}
+
 	if m.ArchivedAt != nil {
 		fmt.Printf("Archived:  %s\n", m.ArchivedAt.Format("2006-01-02 15:04:05"))
 	}