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/ready.go

@@ -39,6 +39,7 @@ This is useful for agents executing molecules to see which steps can run next.`,
 		labels, _ := cmd.Flags().GetStringSlice("label")
 		labelsAny, _ := cmd.Flags().GetStringSlice("label-any")
 		issueType, _ := cmd.Flags().GetString("type")
+		issueType = util.NormalizeIssueType(issueType) // Expand aliases (mr→merge-request, etc.)
 		parentID, _ := cmd.Flags().GetString("parent")
 		molTypeStr, _ := cmd.Flags().GetString("mol-type")
 		prettyFormat, _ := cmd.Flags().GetBool("pretty")
@@ -441,7 +442,7 @@ func init() {
 	readyCmd.Flags().StringP("sort", "s", "hybrid", "Sort policy: hybrid (default), priority, oldest")
 	readyCmd.Flags().StringSliceP("label", "l", []string{}, "Filter by labels (AND: must have ALL). Can combine with --label-any")
 	readyCmd.Flags().StringSlice("label-any", []string{}, "Filter by labels (OR: must have AT LEAST ONE). Can combine with --label")
-	readyCmd.Flags().StringP("type", "t", "", "Filter by issue type (task, bug, feature, epic, merge-request)")
+	readyCmd.Flags().StringP("type", "t", "", "Filter by issue type (task, bug, feature, epic, merge-request). Aliases: mr→merge-request, feat→feature, mol→molecule")
 	readyCmd.Flags().String("mol", "", "Filter to steps within a specific molecule")
 	readyCmd.Flags().String("parent", "", "Filter to descendants of this bead/epic")
 	readyCmd.Flags().String("mol-type", "", "Filter by molecule type: swarm, patrol, or work")