Iterator.zip Brings Native Data Alignment

This is a small but meaningful standard-library upgrade: JavaScript finally gets a familiar primitive that other languages have offered for years.

• –`Iterator.zip` produces positional arrays, while `Iterator.zipKeyed` preserves readable field names.
• –Strict mode can catch mismatched data sources instead of silently truncating results.
• –Longest mode supports explicit padding, useful for uneven streams and batch processing.
• –The proposal has reached Stage 4, but browser support remains experimental, so polyfills may still be necessary.
• –It reduces dependency and implementation overhead for data pipelines, parsers, and iterator-based application code.