fix(rust): satisfy layout assertions under clippy

Use usize::BITS for the byte offset that Clippy recognizes as a bit-width expression on both the static-CCtx and MT finish projections. Update the focused resource-failure test to provide the compression-job last-job argument required by the callback signature. This keeps the ABI checks architecture-independent while making all-target clippy compile the new tests.

Test Plan:

- ulimit -v 41943040; CARGO_BUILD_JOBS=1 cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings

- git diff --cached --check

rust/src/zstd_compress.rs

@@ -2401,7 +2401,7 @@ const _: () = {
     assert!(offset_of!(ZSTD_rust_initStaticCCtxState, reserve_object) == 5 * size_of::<usize>());
     assert!(offset_of!(ZSTD_rust_initStaticCCtxState, zero) == 6 * size_of::<usize>());
     assert!(offset_of!(ZSTD_rust_initStaticCCtxState, move_workspace) == 7 * size_of::<usize>());
-    assert!(offset_of!(ZSTD_rust_initStaticCCtxState, check_available) == 8 * size_of::<usize>());
+    assert!(offset_of!(ZSTD_rust_initStaticCCtxState, check_available) == usize::BITS as usize);
     assert!(
         offset_of!(ZSTD_rust_initStaticCCtxState, reserve_block_state) == 9 * size_of::<usize>()
     );

rust/src/zstdmt_compress.rs

@@ -310,7 +310,7 @@ const _: () = {
         offset_of!(ZSTDMT_compressionJobFinishProjection, publishConsumed)
             == 7 * size_of::<usize>()
     );
-    assert!(offset_of!(ZSTDMT_compressionJobFinishProjection, signal) == 8 * size_of::<usize>());
+    assert!(offset_of!(ZSTDMT_compressionJobFinishProjection, signal) == usize::BITS as usize);
     assert!(size_of::<ZSTDMT_compressionJobFinishProjection>() == 9 * size_of::<usize>());
 };
 
@@ -5487,7 +5487,7 @@ mod tests {
             || panic!("resource failure must skip context initialization"),
             || panic!("resource failure must skip sequence application"),
             || panic!("resource failure must skip frame-header writing"),
-            || panic!("resource failure must skip compression"),
+            |_| panic!("resource failure must skip compression"),
             || panic!("resource failure must skip tracing"),
         );