refactor: consolidate #![allow(clippy::cast_*)] to crate roots

Add the cast-allow block to zesdex-entities/src/lib.rs and
zesdex-utils/src/lib.rs (which lacked it), then remove from
65 sub-files across all 8 crates. Build and all 223 tests
continue to pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/zesdex-cms/src/infrastructure/persistence/memory_repo.rs

@@ -7,13 +7,6 @@
 //! name, description, kind, created_at, updated_at, lifecycle,
 //! outcome, scope, before, after, provenances
 
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
-
 use std::collections::HashMap;
 use std::io::Write;
 use std::path::Path;