feat(types): add rig identity bead type (gt-zmznh)

- Add TypeRig constant to IssueType enum
- Update IsValid() method to include TypeRig
- Add UI color (orange) and style for rig type
- Update CLI flag descriptions in create and update commands
- Add Obsidian export tag for rig type
- Add comprehensive test cases for rig and other newer types

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

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

cmd/bd/update.go

@@ -105,7 +105,7 @@ create, update, show, or close operation).`,
 			issueType, _ := cmd.Flags().GetString("type")
 			// Validate issue type
 			if !types.IssueType(issueType).IsValid() {
-				FatalErrorRespectJSON("invalid issue type %q. Valid types: bug, feature, task, epic, chore, merge-request, molecule, gate", issueType)
+				FatalErrorRespectJSON("invalid issue type %q. Valid types: bug, feature, task, epic, chore, merge-request, molecule, gate, agent, role, rig, convoy, event, slot", issueType)
 			}
 			updates["issue_type"] = issueType
 		}
@@ -595,7 +595,7 @@ func init() {
 	updateCmd.Flags().StringP("status", "s", "", "New status")
 	registerPriorityFlag(updateCmd, "")
 	updateCmd.Flags().String("title", "", "New title")
-	updateCmd.Flags().StringP("type", "t", "", "New type (bug|feature|task|epic|chore|merge-request|molecule|gate)")
+	updateCmd.Flags().StringP("type", "t", "", "New type (bug|feature|task|epic|chore|merge-request|molecule|gate|agent|role|rig|convoy|event|slot)")
 	registerCommonIssueFlags(updateCmd)
 	updateCmd.Flags().String("acceptance-criteria", "", "DEPRECATED: use --acceptance")
 	_ = updateCmd.Flags().MarkHidden("acceptance-criteria") // Only fails if flag missing (caught in tests)