Fix circular ESM dependency in base-action while restoring CHECK_USER_ACCESS extensibility

[Copilot]

The previous fix for the circular module dependency (base-action → actions-registery → check-user-access → base-action) broke extensibility: calling getUserAccess() directly bypassed the registry, preventing users from overriding CHECK_USER_ACCESS with a custom action.

Changes

• base-action.ts: Replace static getUserAccess import with a dynamic import() inside verifyAccess(). The deferred import resolves after all modules are initialized, eliminating the circular init issue while keeping the registry delegation intact.
• base-action.ts: Throw an explicit ActionError (ACCESS_CHECK_NOT_FOUND) if CHECK_USER_ACCESS is missing from the registry instead of silently bypassing the check.
• get-user-access.ts: Retained as a standalone helper used by CheckUserAccessAction directly.

// verifyAccess() in ChaiBaseAction — no static import of actions-registery at module level
protected async verifyAccess(): Promise<void> {
  if (!this.context) throw new ActionError("Context not set", "CONTEXT_NOT_SET", 500);
  const { getChaiAction } = await import("./actions-registery"); // lazy — no circular init
  const checkUserAccessAction = getChaiAction("CHECK_USER_ACCESS");
  if (!checkUserAccessAction) {
    throw new ActionError("CHECK_USER_ACCESS action not registered", "ACCESS_CHECK_NOT_FOUND", 500);
  }
  checkUserAccessAction.setContext(this.context);
  await checkUserAccessAction.execute({});
}

Users can still override the default access check by registering a custom action:

registry.register("CHECK_USER_ACCESS", new MyCustomAccessAction());

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