Add Nix flake for mciasctl and mciasgrpcctl

Vendor dependencies and expose control program binaries via
nix build. Uses nixpkgs-unstable for Go 1.26 support.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

vendor/google.golang.org/protobuf/internal/genid/wrappers.go

@@ -0,0 +1,13 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package genid
+
+import "google.golang.org/protobuf/reflect/protoreflect"
+
+// Generic field name and number for messages in wrappers.proto.
+const (
+	WrapperValue_Value_field_name   protoreflect.Name        = "value"
+	WrapperValue_Value_field_number protoreflect.FieldNumber = 1
+)