Switch remote deploy to vendored source builds

Move remote deployment to a vendored source bundle built on the target host via Docker so redeploys no longer require local cross-compilation or host Go installation.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

vendor/github.com/jchv/go-winloader/internal/winloader/nativearch_386.go

@@ -0,0 +1,9 @@
+package winloader
+
+import (
+	"github.com/jchv/go-winloader/internal/pe"
+)
+
+// NativeArch is a constant that will be equal to the PE machine type
+// enumeration value that corresponds to the arch the binary is running as.
+const NativeArch = pe.ImageFileMachinei386