You’re correct. The cryptographic chain proves “this middleware has processed this action and has recorded it,” not that the enforcement logic itself was correct or that the code running was what you think it was. Those are both different guarantees and I have been conflating them.
On “nothing too special about doing this with LLMs,” also fair. The primitives (policy enforcement, audit trails, non-repudiation) aren’t new. The bet is that AI agents will need these at a scale and standardization level that does not exist yet, and having it as a composable library matters when every framework (LangChain, CrewAI, Vercel AI SDK) is building agents differently. But the underlying cryptography isn’t novel.