Initial commit: n8n Strike API node

- Add Strike API credentials configuration
- Implement Strike node with 9 resources (Account, Balance, Currency Exchange, Deposit, Invoice, Payment, Payment Method, Payout, Rates)
- Add comprehensive operation descriptions for all resources
- Include CLAUDE.MD documentation
- Set up build configuration with TypeScript, ESLint, and Prettier

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

node_modules/undertaker/lib/helpers/validateRegistry.js

@@ -0,0 +1,41 @@
+'use strict';
+
+var assert = require('assert');
+
+function isFunction(fn) {
+  return typeof fn === 'function';
+}
+
+function isConstructor(registry) {
+  if (!(registry && registry.prototype)) {
+    return false;
+  }
+
+  var hasProtoGet = isFunction(registry.prototype.get);
+  var hasProtoSet = isFunction(registry.prototype.set);
+  var hasProtoInit = isFunction(registry.prototype.init);
+  var hasProtoTasks = isFunction(registry.prototype.tasks);
+
+  if (hasProtoGet || hasProtoSet || hasProtoInit || hasProtoTasks) {
+    return true;
+  }
+
+  return false;
+}
+
+function validateRegistry(registry) {
+  try {
+    assert(isFunction(registry.get), 'Custom registry must have `get` function');
+    assert(isFunction(registry.set), 'Custom registry must have `set` function');
+    assert(isFunction(registry.init), 'Custom registry must have `init` function');
+    assert(isFunction(registry.tasks), 'Custom registry must have `tasks` function');
+  } catch (err) {
+    if (isConstructor(registry)) {
+      assert(false, 'Custom registries must be instantiated, but it looks like you passed a constructor');
+    } else {
+      throw err;
+    }
+  }
+}
+
+module.exports = validateRegistry;