fix: restore --resolution alias for bd close (GH#746)

The --resolution flag was accidentally removed by a bd sync commit.
This restores the hidden alias for --reason, following Jira CLI convention.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cmd/bd/show.go

@@ -1004,6 +1004,10 @@ var closeCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 		CheckReadonly("close")
 		reason, _ := cmd.Flags().GetString("reason")
+		if reason == "" {
+			// Check --resolution alias (Jira CLI convention)
+			reason, _ = cmd.Flags().GetString("resolution")
+		}
 		if reason == "" {
 			reason = "Closed"
 		}
@@ -1487,6 +1491,8 @@ func init() {
 	rootCmd.AddCommand(editCmd)
 
 	closeCmd.Flags().StringP("reason", "r", "", "Reason for closing")
+	closeCmd.Flags().String("resolution", "", "Alias for --reason (Jira CLI convention)")
+	_ = closeCmd.Flags().MarkHidden("resolution") // Hidden alias for agent/CLI ergonomics
 	closeCmd.Flags().BoolP("force", "f", false, "Force close pinned issues")
 	closeCmd.Flags().Bool("continue", false, "Auto-advance to next step in molecule")
 	closeCmd.Flags().Bool("no-auto", false, "With --continue, show next step but don't claim it")