v0.1.8

• Added strided QuickJS and PocketPy counted loops with increment, decrement, and finite literal step updates.
• Added single-level guarded break and continue with exact loop-state merges.
• Added typed effectful CFG runtime-helper calls with dominance checks, mixed arguments, ABI lowering, and package coverage.
• Split Word and Float64 CFG register classes and kept loop-carried floating-point values resident on all three backends.