Bootstrap OpenBitdo clean-room SDK and reliability milestone

sdk/scripts/cleanroom_guard.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT"
+
+forbidden_pattern='decompiled(_dll|_autoupdate)?/|bundle_extract/|extracted(_net)?/|session-ses_35e4|8BitDo_Ultimate_Software_V2\.decompiled\.cs'
+scan_paths=(crates tests .github)
+
+if rg -n --hidden -g '!target/**' "$forbidden_pattern" "${scan_paths[@]}"; then
+  echo "cleanroom guard failed: forbidden dirty-room reference detected"
+  exit 1
+fi
+
+echo "cleanroom guard passed"