Add info and edit commands for interactive task management

- Add 'opal info' command to display detailed task information
  - Shows all task attributes including UUID, timestamps, and metadata
  - Supports flexible syntax (opal info 2 or opal 2 info)
  - Displays recurrence information and parent UUID for recurring tasks

- Add 'opal edit' command to edit tasks in $EDITOR
  - Opens task in text editor with human-readable format
  - Supports all editable fields with smart date formatting
  - Special handling for recurring tasks (updates parent template)
  - Status changes trigger appropriate methods (Complete/Delete)
  - Auto-saves changes on editor exit without confirmation
  - Clear validation and error messages

- Register new commands in root command dispatcher

opal-task/cmd/info.go

@@ -0,0 +1,80 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+
+	"git.jnss.me/joakim/opal/internal/engine"
+	"github.com/spf13/cobra"
+)
+
+var infoCmd = &cobra.Command{
+	Use:   "info [filter...]",
+	Short: "Show detailed information about a task",
+	Long: `Display all details about a specific task.
+
+Examples:
+  opal info 2              # Show details for task with display ID 2
+  opal 2 info              # Flexible syntax (same as above)
+  opal info +urgent        # Show details if only one task matches`,
+	Run: func(cmd *cobra.Command, args []string) {
+		parsed := getParsedArgs(cmd)
+		if err := showTaskInfo(parsed.Filters); err != nil {
+			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+			os.Exit(1)
+		}
+	},
+}
+
+func showTaskInfo(args []string) error {
+	// Validate we have a filter
+	if len(args) == 0 {
+		return fmt.Errorf("no task specified for info command")
+	}
+
+	// Parse filter
+	filter, err := engine.ParseFilter(args)
+	if err != nil {
+		return fmt.Errorf("failed to parse filter: %w", err)
+	}
+
+	// Load working set to resolve IDs
+	ws, err := engine.LoadWorkingSet()
+	if err != nil {
+		return fmt.Errorf("failed to load working set: %w", err)
+	}
+
+	// Resolve task
+	var task *engine.Task
+
+	if len(filter.IDs) > 0 {
+		// Resolve display ID (should be exactly one)
+		if len(filter.IDs) != 1 {
+			return fmt.Errorf("info requires exactly one task (specified %d IDs)", len(filter.IDs))
+		}
+		task, err = ws.GetTaskByDisplayID(filter.IDs[0])
+		if err != nil {
+			return err
+		}
+	} else {
+		// Use filter to get tasks
+		tasks, err := engine.GetTasks(filter)
+		if err != nil {
+			return fmt.Errorf("failed to get tasks: %w", err)
+		}
+
+		if len(tasks) == 0 {
+			return fmt.Errorf("no task found matching filter")
+		}
+		if len(tasks) > 1 {
+			return fmt.Errorf("info requires exactly one task (filter matched %d tasks)", len(tasks))
+		}
+
+		task = tasks[0]
+	}
+
+	// Display detailed info
+	fmt.Println(engine.FormatTaskDetail(task))
+
+	return nil
+}