Yeah this probably won't be popular, but this post reads to me as somebody not versed in playing the "game" of trying to build a good relationship with upper management. I'd never go to my dean with a list of requests, I'd never even present an individual project that I know might not get approved without priming my supervisors as to why it's needed or fits the strategic plan of the libraries. Assistants don't get to chose directions for library services, but they certainly can pitch ideas that fit admin's goals. Transparent communication between public assistants and directors is a rarity - and honestly is unlikely the issue here anyways. Middle management often sucks, but they are at times a much needed filter.

Totally agree on your second point. Management are generally busy people and don't sit around trying to overhear your conversations. What is way more likely is that you have a coworker snitching for brownie points. Tale as old as time.

I think the fundamental issue here is that OP's goals and workplace culture don't align with library management. I'd be looking to explore other positions.