treewide: enforce strict clippy check

fix-vm/src/instructions/with_scope.rs

@@ -6,14 +6,21 @@ use smallvec::SmallVec;
 use crate::{Break, BytecodeReader, CallFrame, Step, VmRuntimeCtx};
 
 #[inline(always)]
+#[expect(
+    clippy::indexing_slicing,
+    clippy::cast_sign_loss,
+    reason = "counter is a non-negative with-scope index in 0..n, staying within the namespaces vec of length n"
+)]
 pub(crate) fn op_lookup_with<'gc, M: Machine<'gc>>(
     m: &mut M,
     ctx: &mut impl VmRuntimeCtx,
     reader: &mut BytecodeReader<'_>,
     mc: &gc_arena::Mutation<'gc>,
 ) -> Step {
-    #[allow(clippy::unwrap_used)]
-    let counter = m.peek_forced(0).downcast::<i32>().unwrap();
+    let counter = m
+        .peek_forced(0)
+        .downcast::<i32>()
+        .expect("stack slot must be an integer");
 
     let name = reader.read_string_id();
     let n = reader.read_u8();