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>

internal/types/types.go

@@ -417,6 +417,7 @@ const (
 	TypeGate         IssueType = "gate"          // Async coordination gate
 	TypeAgent        IssueType = "agent"         // Agent identity bead
 	TypeRole         IssueType = "role"          // Agent role definition
+	TypeRig          IssueType = "rig"           // Rig identity bead (project container)
 	TypeConvoy       IssueType = "convoy"        // Cross-project tracking with reactive completion
 	TypeEvent        IssueType = "event"         // Operational state change record
 	TypeSlot         IssueType = "slot"          // Exclusive access slot (merge-slot gate)
@@ -425,7 +426,7 @@ const (
 // IsValid checks if the issue type value is valid
 func (t IssueType) IsValid() bool {
 	switch t {
-	case TypeBug, TypeFeature, TypeTask, TypeEpic, TypeChore, TypeMessage, TypeMergeRequest, TypeMolecule, TypeGate, TypeAgent, TypeRole, TypeConvoy, TypeEvent, TypeSlot:
+	case TypeBug, TypeFeature, TypeTask, TypeEpic, TypeChore, TypeMessage, TypeMergeRequest, TypeMolecule, TypeGate, TypeAgent, TypeRole, TypeRig, TypeConvoy, TypeEvent, TypeSlot:
 		return true
 	}
 	return false

internal/types/types_test.go

@@ -401,6 +401,12 @@ func TestIssueTypeIsValid(t *testing.T) {
 		{TypeTask, true},
 		{TypeEpic, true},
 		{TypeChore, true},
+		{TypeAgent, true},
+		{TypeRole, true},
+		{TypeRig, true},
+		{TypeConvoy, true},
+		{TypeEvent, true},
+		{TypeSlot, true},
 		{IssueType("invalid"), false},
 		{IssueType(""), false},
 	}
@@ -430,6 +436,7 @@ func TestIssueTypeRequiredSections(t *testing.T) {
 		{TypeGate, 0, ""},
 		{TypeAgent, 0, ""},
 		{TypeRole, 0, ""},
+		{TypeRig, 0, ""},
 		{TypeConvoy, 0, ""},
 		{TypeEvent, 0, ""},
 		{TypeMergeRequest, 0, ""},