refactor(plugin-sdk): share boolean action param parsing

src/plugin-sdk/boolean-param.ts

@@ -0,0 +1,19 @@
+export function readBooleanParam(
+  params: Record<string, unknown>,
+  key: string,
+): boolean | undefined {
+  const raw = params[key];
+  if (typeof raw === "boolean") {
+    return raw;
+  }
+  if (typeof raw === "string") {
+    const trimmed = raw.trim().toLowerCase();
+    if (trimmed === "true") {
+      return true;
+    }
+    if (trimmed === "false") {
+      return false;
+    }
+  }
+  return undefined;
+}