fix: use rig prefixes for agent bead IDs

Align rig-scoped agent beads with route prefixes so crew add/prime/status resolve the same IDs across rigs. Add tests that assert rig-prefixed agent IDs in prime and status.

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

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

internal/cmd/status_test.go

@@ -0,0 +1,97 @@
+package cmd
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/steveyegge/gastown/internal/beads"
+	"github.com/steveyegge/gastown/internal/rig"
+)
+
+func captureStdout(t *testing.T, fn func()) string {
+	t.Helper()
+	old := os.Stdout
+	r, w, err := os.Pipe()
+	if err != nil {
+		t.Fatalf("create pipe: %v", err)
+	}
+	os.Stdout = w
+
+	fn()
+
+	_ = w.Close()
+	os.Stdout = old
+
+	var buf bytes.Buffer
+	if _, err := io.Copy(&buf, r); err != nil {
+		t.Fatalf("read stdout: %v", err)
+	}
+	_ = r.Close()
+
+	return buf.String()
+}
+
+func TestDiscoverRigAgents_UsesRigPrefix(t *testing.T) {
+	townRoot := t.TempDir()
+	writeTestRoutes(t, townRoot, []beads.Route{
+		{Prefix: "bd-", Path: "beads/mayor/rig"},
+	})
+
+	r := &rig.Rig{
+		Name:       "beads",
+		Path:       filepath.Join(townRoot, "beads"),
+		HasWitness: true,
+	}
+
+	allAgentBeads := map[string]*beads.Issue{
+		"bd-beads-witness": {
+			ID:         "bd-beads-witness",
+			AgentState: "running",
+			HookBead:   "bd-hook",
+		},
+	}
+	allHookBeads := map[string]*beads.Issue{
+		"bd-hook": {ID: "bd-hook", Title: "Pinned"},
+	}
+
+	agents := discoverRigAgents(map[string]bool{}, r, nil, allAgentBeads, allHookBeads, nil, true)
+	if len(agents) != 1 {
+		t.Fatalf("discoverRigAgents() returned %d agents, want 1", len(agents))
+	}
+
+	if agents[0].State != "running" {
+		t.Fatalf("agent state = %q, want %q", agents[0].State, "running")
+	}
+	if !agents[0].HasWork {
+		t.Fatalf("agent HasWork = false, want true")
+	}
+	if agents[0].WorkTitle != "Pinned" {
+		t.Fatalf("agent WorkTitle = %q, want %q", agents[0].WorkTitle, "Pinned")
+	}
+}
+
+func TestRenderAgentDetails_UsesRigPrefix(t *testing.T) {
+	townRoot := t.TempDir()
+	writeTestRoutes(t, townRoot, []beads.Route{
+		{Prefix: "bd-", Path: "beads/mayor/rig"},
+	})
+
+	agent := AgentRuntime{
+		Name:    "witness",
+		Address: "beads/witness",
+		Role:    "witness",
+		Running: true,
+	}
+
+	output := captureStdout(t, func() {
+		renderAgentDetails(agent, "", nil, townRoot)
+	})
+
+	if !strings.Contains(output, "bd-beads-witness") {
+		t.Fatalf("output %q does not contain rig-prefixed bead ID", output)
+	}
+}