feat(list): Add type aliases for --type flag (gt-pvhsv)

Add convenience aliases for common type names:
- mr → merge-request
- feat → feature
- mol → molecule

Applied to bd list, bd ready, and bd export commands.
Case-insensitive matching (MR, Mr, mr all work).

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

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

cmd/bd/list.go

@@ -375,6 +375,7 @@ var listCmd = &cobra.Command{
 		status, _ := cmd.Flags().GetString("status")
 		assignee, _ := cmd.Flags().GetString("assignee")
 		issueType, _ := cmd.Flags().GetString("type")
+		issueType = util.NormalizeIssueType(issueType) // Expand aliases (mr→merge-request, etc.)
 		limit, _ := cmd.Flags().GetInt("limit")
 		allFlag, _ := cmd.Flags().GetBool("all")
 		formatStr, _ := cmd.Flags().GetString("format")
@@ -936,7 +937,7 @@ func init() {
 	listCmd.Flags().StringP("status", "s", "", "Filter by status (open, in_progress, blocked, deferred, closed)")
 	registerPriorityFlag(listCmd, "")
 	listCmd.Flags().StringP("assignee", "a", "", "Filter by assignee")
-	listCmd.Flags().StringP("type", "t", "", "Filter by type (bug, feature, task, epic, chore, merge-request, molecule, gate, convoy)")
+	listCmd.Flags().StringP("type", "t", "", "Filter by type (bug, feature, task, epic, chore, merge-request, molecule, gate, convoy). Aliases: mr→merge-request, feat→feature, mol→molecule")
 	listCmd.Flags().StringSliceP("label", "l", []string{}, "Filter by labels (AND: must have ALL). Can combine with --label-any")
 	listCmd.Flags().StringSlice("label-any", []string{}, "Filter by labels (OR: must have AT LEAST ONE). Can combine with --label")
 	listCmd.Flags().String("title", "", "Filter by title text (case-insensitive substring match)")