chore: initialize go-sip repository

scripts/check-proto.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+set -eu
+
+root=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
+cd "$root"
+
+buf lint
+buf build --error-format=json >/dev/null
+buf generate
+go test ./gen/agent/v1
+
+python3 - <<'PY'
+from hashlib import sha256
+from pathlib import Path
+import json
+
+root = Path('.')
+manifest = json.loads((root / 'proto/manifest.json').read_text())
+for entry in manifest.get('files', []):
+    path = root / entry['path']
+    if not path.is_file():
+        raise SystemExit(f'missing Proto manifest file: {entry["path"]}')
+    digest = sha256(path.read_bytes()).hexdigest()
+    if digest != entry['sha256']:
+        raise SystemExit(f'Proto manifest hash mismatch: {entry["path"]}')
+print(f'proto manifest verified: {len(manifest.get("files", []))} files')
+PY