fix: .map()/.filter() on class arrays without type annotation

[cs01]

Summary

• [new Item("a"), new Item("b")] without an explicit Item[] type annotation was misclassified as a number array (%Array*) instead of an object array (%ObjectArray*)
• This caused .map() and .filter() callbacks to receive class instance pointers as double values, producing wrong results (empty strings, wrong counts)
• Now the type inferrer checks array literal elements for new expressions that resolve to known classes, and falls back to recursive element type resolution for other non-primitive types

Test plan

• New test fixture arrays/class-array-map-filter.ts — .map() extracts field, .filter() filters by field value
• All existing tests pass
• Self-hosting Stage 1 passes

🤖 Generated with Claude Code