Add nostrlib to agents stuff

AGENTS.md

@@ -75,6 +75,7 @@ of chapters, but is not a source of implementation patterns.
 | `ref/applesauce` | TypeScript | Libraries for building nostr web clients (noStrudel) |
 | `ref/ndk` | TypeScript | Nostr Development Kit with framework integrations |
 | `ref/nostr-gadgets` | TypeScript | High-level nostr client utilities (JSR) |
+| `ref/nostrlib` | Go | Comprehensive Go library for relays, clients, and hybrid apps (fiatjaf) |
 | `ref/nostr-tools` | TypeScript | Low-level nostr tools, minimal dependencies |
 | `ref/rust-nostr` | Rust | Full Rust implementation with multiple crates |
 | `ref/welshman` | TypeScript | Nostr toolkit extracted from the Coracle client |
@@ -96,7 +97,7 @@ Chapters are developed in three phases using slash commands:
 ## Code Style
 
 - Rust code should be idiomatic and well-documented
-- Prefer clarity over cleverness — this is a teaching resource
+- Prefer clarity over cleverness
 - Keep dependencies minimal
 - All public items need doc comments that explain the *why*
 - Code must compile and pass `just all` before a chapter is considered complete