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-backend/src/app/bgbash/control.rs

@@ -1,9 +1,3 @@
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
 //! Global registry of running background bash jobs, and control operations
 //! (output polling, kill) exposed to the rest of the app.
 //!

crates/zesdex-backend/src/app/mode/effort.rs

@@ -1,9 +1,3 @@
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
 //! Effort mode: cycles the agent's reasoning effort level, which scales the
 //! LLM's temperature and `max_tokens` for subsequent turns.
 use crate::app::state::rest::AppStateRest;

crates/zesdex-backend/src/app/mode/rewind.rs

@@ -1,9 +1,3 @@
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
 //! Rewind mode: restores a file to a pre-edit snapshot stored in the
 //! session's `SQLite` blob store.
 use crate::app::state::rest::AppStateRest;

crates/zesdex-backend/src/app/review/probe.rs

@@ -1,9 +1,3 @@
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
 //! Build/test probing: running a verification command and capturing its
 //! pass/fail/timeout outcome for the review subagent.
 

crates/zesdex-backend/src/app/runtime/actions/mod.rs

@@ -16,8 +16,6 @@
 //! running turns on plain OS threads (rather than blocking the main loop)
 //! keeps the TUI responsive while the LLM streams.
 
-#![allow(clippy::cast_possible_truncation, clippy::cast_sign_loss, clippy::cast_precision_loss, clippy::cast_possible_wrap)]
-
 mod handlers;
 mod io;
 mod memory;

crates/zesdex-backend/src/app/state/types.rs

@@ -1,9 +1,3 @@
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
 //! Shared small state types: toasts, overlays, the transcript cache,
 //! tool execution model, and call origin tags.
 use serde::{Deserialize, Serialize};