v0.17.16 — MSL Backend Hardening

Fixed (MSL)

• 64-bit atomic capability validation (#79, PR #82, @besmpl) —
  msl.Compile now returns a descriptive error for 64-bit atomic operations
  that Metal cannot represent instead of emitting invalid intrinsics. Matching
  Rust Naga, result-discarded min/max in storage address space remain
  supported; loads, stores, full operations, result-producing min/max, and
  workgroup min/max are rejected.
• Swizzle of binary expression missing parentheses (#83) —
  writeSwizzle now wraps binary/select sub-expressions in parentheses,
  matching Rust naga's is_scoped=false semantics. Without this, C++ member
  access (.) bound tighter than arithmetic operators, causing
  mat * vec.xyz instead of (mat * vec).xyz — a type error that Metal
  compiler rejected. Discovered via g3d standard.wgsl shader on Apple M5.