docs: tidy AGENTS.md and clean-room doc

AGENTS.md

@@ -1,8 +1,6 @@
 # AGENTS.md
 
-Shared Rust libraries for the Craft Apps. The shared standards live in
-[craftrules](https://github.com/storytold/craftrules) (`../../craftrules` on a dev machine): read its
-`AGENTS.md`, then `standards/never-crash.md`, `standards/engineering.md` and `standards/licensing.md`.
+Shared Rust libraries for the Craft Apps.
 
 - **Never crash.** Every crate's `lib.rs` starts with
   `#![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]`.

docs/clean-room.md

@@ -4,9 +4,7 @@ Several crates here read or write formats that other open-source projects also i
 under licences the Craft apps cannot take code from (GPL, LGPL, AGPL, CDDL) or under terms that
 forbid it (Adobe's). This document is the standard a format crate follows so that every line of
 it is ours, and so that a reviewer can check that claim from the repository alone. It is the
-written form of what `craft-jpeg`, `craft-media` and `craft-crw` did; the suite-wide rules live in
-[craftrules](https://github.com/storytold/craftrules) (`standards/licensing.md`,
-`standards/never-crash.md`), which this does not replace.
+written form of what `craft-jpeg`, `craft-media` and `craft-crw` did.
 
 ## What "clean-room" means here