refactor: remove unused bd pin/unpin/hook commands (bd-x0zl)

Analysis found these commands are dead code:
- gt never calls `bd pin` - uses `bd update --status=pinned` instead
- Beads.Pin() wrapper exists but is never called
- bd hook functionality duplicated by gt mol status
- Code comment says "pinned field is cosmetic for bd hook visibility"

Removed:
- cmd/bd/pin.go
- cmd/bd/unpin.go
- cmd/bd/hook.go

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

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

internal/rpc/client_gate_shutdown_test.go

@@ -0,0 +1,107 @@
+package rpc
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+
+	"github.com/steveyegge/beads/internal/types"
+)
+
+func TestClient_GateLifecycleAndShutdown(t *testing.T) {
+	_, client, cleanup := setupTestServer(t)
+	defer cleanup()
+
+	createResp, err := client.GateCreate(&GateCreateArgs{
+		Title:     "Test Gate",
+		AwaitType: "human",
+		AwaitID:   "",
+		Timeout:   5 * time.Minute,
+		Waiters:   []string{"mayor/"},
+	})
+	if err != nil {
+		t.Fatalf("GateCreate: %v", err)
+	}
+
+	var created GateCreateResult
+	if err := json.Unmarshal(createResp.Data, &created); err != nil {
+		t.Fatalf("unmarshal GateCreateResult: %v", err)
+	}
+	if created.ID == "" {
+		t.Fatalf("expected created gate ID")
+	}
+
+	listResp, err := client.GateList(&GateListArgs{All: false})
+	if err != nil {
+		t.Fatalf("GateList: %v", err)
+	}
+	var openGates []*types.Issue
+	if err := json.Unmarshal(listResp.Data, &openGates); err != nil {
+		t.Fatalf("unmarshal GateList: %v", err)
+	}
+	if len(openGates) != 1 || openGates[0].ID != created.ID {
+		t.Fatalf("unexpected open gates: %+v", openGates)
+	}
+
+	showResp, err := client.GateShow(&GateShowArgs{ID: created.ID})
+	if err != nil {
+		t.Fatalf("GateShow: %v", err)
+	}
+	var gate types.Issue
+	if err := json.Unmarshal(showResp.Data, &gate); err != nil {
+		t.Fatalf("unmarshal GateShow: %v", err)
+	}
+	if gate.ID != created.ID || gate.IssueType != types.TypeGate {
+		t.Fatalf("unexpected gate: %+v", gate)
+	}
+
+	waitResp, err := client.GateWait(&GateWaitArgs{ID: created.ID, Waiters: []string{"deacon/"}})
+	if err != nil {
+		t.Fatalf("GateWait: %v", err)
+	}
+	var waitResult GateWaitResult
+	if err := json.Unmarshal(waitResp.Data, &waitResult); err != nil {
+		t.Fatalf("unmarshal GateWaitResult: %v", err)
+	}
+	if waitResult.AddedCount != 1 {
+		t.Fatalf("expected 1 waiter added, got %d", waitResult.AddedCount)
+	}
+
+	closeResp, err := client.GateClose(&GateCloseArgs{ID: created.ID, Reason: "done"})
+	if err != nil {
+		t.Fatalf("GateClose: %v", err)
+	}
+	var closedGate types.Issue
+	if err := json.Unmarshal(closeResp.Data, &closedGate); err != nil {
+		t.Fatalf("unmarshal GateClose: %v", err)
+	}
+	if closedGate.Status != types.StatusClosed {
+		t.Fatalf("expected closed status, got %q", closedGate.Status)
+	}
+
+	listResp, err = client.GateList(&GateListArgs{All: false})
+	if err != nil {
+		t.Fatalf("GateList open: %v", err)
+	}
+	if err := json.Unmarshal(listResp.Data, &openGates); err != nil {
+		t.Fatalf("unmarshal GateList open: %v", err)
+	}
+	if len(openGates) != 0 {
+		t.Fatalf("expected no open gates, got %+v", openGates)
+	}
+
+	listResp, err = client.GateList(&GateListArgs{All: true})
+	if err != nil {
+		t.Fatalf("GateList all: %v", err)
+	}
+	if err := json.Unmarshal(listResp.Data, &openGates); err != nil {
+		t.Fatalf("unmarshal GateList all: %v", err)
+	}
+	if len(openGates) != 1 || openGates[0].ID != created.ID {
+		t.Fatalf("expected 1 total gate, got %+v", openGates)
+	}
+
+	if err := client.Shutdown(); err != nil {
+		t.Fatalf("Shutdown: %v", err)
+	}
+}