WASI phase 1: perry-runtime builds for 32-bit (ILP32) targets #11376

Part of #11375.

perry-runtime assumes 64-bit pointers in several places that fail to compile on any ILP32 target (wasm32, and also arm64_32-apple-watchos, which has silently stopped building):

• closure/box_captures.rs: FRAME_RELEASED: usize = 1 << 63, tag shift 60 on usize
• layout asserts pinned to LP64 values: ObjectHeader.meta offset, ArrayHeader size, MapHeader.used, SetHeader.used, HotTls inline-state/implicit-this offsets, ShadowStackState.len, size_of::<Box>()
• native_handle.rs type mismatch

These asserts exist to keep inline codegen in sync; on ILP32 they must assert the values perry-codegen/src/target_layout.rs emits for the target, not LP64 constants.

Done when: the ILP32 error family is gone from cargo check -p perry-runtime --target wasm32-wasip2 --no-default-features (remaining errors are platform-gating only, phase 2), with a note of how the check was run.