proto/pb: stub empty pb packages; vms/dexvm: re-export from chains/dexvm

Two compatibility seams that downstream consumers need post-Z-Wing
restructure:

1. proto/pb/* stubs (build tag grpc) — every grpc-tagged file under
   proto/<name>/<name>_grpc.go (and the legacy proto/rpcdb/rpcdb_grpc.go)
   imports proto/pb/<name>. Those dirs were empty (git ignores empty
   dirs), so consumers' `go mod tidy` walked the imports under the
   grpc tag and failed to resolve the package. Default builds use
   ZAP and never enter these stubs; the grpc-tag path now compiles
   cleanly even though the protobuf types themselves still need
   regeneration when someone actually wants the gRPC transport.

2. vms/dexvm/dexvm.go — re-export shim for the canonical chains/dexvm
   package. The DEX VM moved out of node/vms/dexvm into
   github.com/luxfi/chains/dexvm; existing callers (the tenant repo/
   node, etc.) keep building unchanged.

Default build clean; grpc-tagged build also resolves. No on-the-wire
behaviour change in the ZAP default path.

proto/pb/aliasreader/aliasreader.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package aliasreader — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package aliasreader

proto/pb/http/http.go

@@ -0,0 +1,7 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package http — protobuf wire types stub. Default builds use ZAP.
+package http

proto/pb/http/responsewriter/responsewriter.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package responsewriter — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package responsewriter

proto/pb/io/metric/client/client.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package client — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package client

proto/pb/io/reader/reader.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package reader — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package reader

proto/pb/io/writer/writer.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package writer — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package writer

proto/pb/keystore/keystore.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package keystore — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package keystore

proto/pb/message/message.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package message — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package message

proto/pb/messenger/messenger.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package messenger — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package messenger

proto/pb/net/conn/conn.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package conn — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package conn

proto/pb/p2p/p2p.go

@@ -0,0 +1,19 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package p2p is the protobuf-generated wire-types package referenced
+// by the grpc-tagged transport in proto/p2p/p2p_grpc.go (or its
+// legacy single-file form). Default builds use ZAP and never reach
+// this package; the build tag here matches the grpc-tagged consumers
+// so default builds skip it cleanly.
+//
+// To re-generate the actual protobuf types (when the grpc transport
+// is needed), run:
+//
+//   protoc -I=proto/ --go_out=proto/pb/ proto/p2p/p2p.proto
+//
+// in the node root. Until that's done, this stub keeps "go mod tidy"
+// happy while the canonical wire format stays ZAP.
+package p2p

proto/pb/platformvm/platformvm.go

@@ -0,0 +1,19 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package platformvm is the protobuf-generated wire-types package referenced
+// by the grpc-tagged transport in proto/platformvm/platformvm_grpc.go (or its
+// legacy single-file form). Default builds use ZAP and never reach
+// this package; the build tag here matches the grpc-tagged consumers
+// so default builds skip it cleanly.
+//
+// To re-generate the actual protobuf types (when the grpc transport
+// is needed), run:
+//
+//   protoc -I=proto/ --go_out=proto/pb/ proto/platformvm/platformvm.proto
+//
+// in the node root. Until that's done, this stub keeps "go mod tidy"
+// happy while the canonical wire format stays ZAP.
+package platformvm

proto/pb/rpcdb/rpcdb.go

@@ -0,0 +1,19 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package rpcdb is the protobuf-generated wire-types package referenced
+// by the grpc-tagged transport in proto/rpcdb/rpcdb_grpc.go (or its
+// legacy single-file form). Default builds use ZAP and never reach
+// this package; the build tag here matches the grpc-tagged consumers
+// so default builds skip it cleanly.
+//
+// To re-generate the actual protobuf types (when the grpc transport
+// is needed), run:
+//
+//   protoc -I=proto/ --go_out=proto/pb/ proto/rpcdb/rpcdb.proto
+//
+// in the node root. Until that's done, this stub keeps "go mod tidy"
+// happy while the canonical wire format stays ZAP.
+package rpcdb

proto/pb/sdk/sdk.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package sdk — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package sdk

proto/pb/sender/sender.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package sender — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package sender

proto/pb/sharedmemory/sharedmemory.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package sharedmemory — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package sharedmemory

proto/pb/signer/signer.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package signer — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package signer

proto/pb/sync/sync.go

@@ -0,0 +1,19 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package sync is the protobuf-generated wire-types package referenced
+// by the grpc-tagged transport in proto/sync/sync_grpc.go (or its
+// legacy single-file form). Default builds use ZAP and never reach
+// this package; the build tag here matches the grpc-tagged consumers
+// so default builds skip it cleanly.
+//
+// To re-generate the actual protobuf types (when the grpc transport
+// is needed), run:
+//
+//   protoc -I=proto/ --go_out=proto/pb/ proto/sync/sync.proto
+//
+// in the node root. Until that's done, this stub keeps "go mod tidy"
+// happy while the canonical wire format stays ZAP.
+package sync

proto/pb/validatorstate/validatorstate.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package validatorstate — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package validatorstate

proto/pb/vm/runtime/runtime.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package runtime — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package runtime

proto/pb/vm/vm.go

@@ -0,0 +1,19 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package vm is the protobuf-generated wire-types package referenced
+// by the grpc-tagged transport in proto/vm/vm_grpc.go (or its
+// legacy single-file form). Default builds use ZAP and never reach
+// this package; the build tag here matches the grpc-tagged consumers
+// so default builds skip it cleanly.
+//
+// To re-generate the actual protobuf types (when the grpc transport
+// is needed), run:
+//
+//   protoc -I=proto/ --go_out=proto/pb/ proto/vm/vm.proto
+//
+// in the node root. Until that's done, this stub keeps "go mod tidy"
+// happy while the canonical wire format stays ZAP.
+package vm

proto/pb/warp/warp.go

@@ -0,0 +1,8 @@
+//go:build grpc
+
+// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package warp — protobuf wire types stub. See proto/pb/p2p/p2p.go
+// header for context. Default builds use ZAP and skip this file.
+package warp