fix(rig): check witness/state.json instead of witness/rig (gm-2ej)

Witnesses don't have git clones like other agents. The detection was
checking for witness/rig which doesn't exist. Now correctly checks for
witness/state.json which is created by AddRig.

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

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

internal/rig/manager.go

@@ -128,9 +128,9 @@ func (m *Manager) loadRig(name string, entry config.RigEntry) (*Rig, error) {
 		}
 	}
 
-	// Check for witness
+	// Check for witness (witnesses don't have clones, just state.json)
-	witnessPath := filepath.Join(rigPath, "witness", "rig")
+	witnessStatePath := filepath.Join(rigPath, "witness", "state.json")
-	if _, err := os.Stat(witnessPath); err == nil {
+	if _, err := os.Stat(witnessStatePath); err == nil {
 		rig.HasWitness = true
 	}
 

internal/rig/manager_test.go

@@ -37,6 +37,12 @@ func createTestRig(t *testing.T, root, name string) {
 		}
 	}
 
+	// Create witness state.json (witnesses don't have clones, just state)
+	witnessState := filepath.Join(rigPath, "witness", "state.json")
+	if err := os.WriteFile(witnessState, []byte(`{"role":"witness"}`), 0644); err != nil {
+		t.Fatalf("write witness state: %v", err)
+	}
+
 	// Create some polecats
 	polecatsDir := filepath.Join(rigPath, "polecats")
 	for _, polecat := range []string{"Toast", "Cheedo"} {

internal/rig/types.go

@@ -37,11 +37,12 @@ type Rig struct {
 }
 
 // AgentDirs are the standard agent directories in a rig.
+// Note: witness doesn't have a /rig subdirectory (no clone needed).
 var AgentDirs = []string{
 	"polecats",
 	"crew",
 	"refinery/rig",
-	"witness/rig",
+	"witness",
 	"mayor/rig",
 }