feat: build infrastructure

Co-authored-by: Copilot <copilot@github.com>

rel/overlays/mcp/bin/bds-mcp

@@ -0,0 +1,7 @@
+#!/bin/sh
+set -eu
+
+SCRIPT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
+RELEASE_ROOT=$(CDPATH= cd -- "$SCRIPT_DIR/../.." && pwd)
+
+exec "$RELEASE_ROOT/bin/bds_mcp" eval "Application.ensure_all_started(:bds); BDS.MCP.Stdio.main()"

rel/overlays/mcp/bin/bds-mcp.bat

@@ -0,0 +1,5 @@
+@echo off
+set SCRIPT_DIR=%~dp0
+set RELEASE_ROOT=%SCRIPT_DIR%..\..
+
+call "%RELEASE_ROOT%\bin\bds_mcp.bat" eval "Application.ensure_all_started(:bds); BDS.MCP.Stdio.main()"