fix boolean class fields and map/filter on class field arrays

[cs01]

Summary

• Boolean class fields now work correctly — field access no longer reads wrong offsets due to i1/double type mismatch in GEP calculations
• .map()/.filter() on class instance arrays stored as class fields now correctly resolve element types in callbacks, so field access in callbacks returns real values instead of garbage

Changes

• member.ts: fix classFieldToLlvm() to return double for boolean (matching actual class struct layout)
• iteration.ts: add resolveObjectArrayElementType() helper that handles member_access expressions (e.g. this.items) in addition to simple variables, used by filter/forEach/reduce/map
• New test fixtures for both fixes

Test plan

• class-boolean-field.ts — boolean field access on class instances
• class-field-array-map-filter.ts — filter/map on this.items inside class methods
• Full npm run verify passes (all 758 tests + 3-stage self-hosting)

🤖 Generated with Claude Code

[github-actions]

Benchmark Results (Linux x86-64)

Benchmark	C	ChadScript	Go	Node	Bun	Place
Binary Trees	1.344s	1.400s	2.968s	1.359s	1.176s	#4
Cold Start	0.6ms	0.6ms	1.1ms	21.9ms	7.5ms	🥇
Fibonacci	0.724s	1.144s	1.429s	2.841s	1.836s	🥈
File I/O	0.071s	0.073s	0.073s	0.228s	0.157s	🥈
JSON Parse/Stringify	0.003s	0.005s	0.017s	0.014s	0.006s	🥈
Matrix Multiply	0.406s	0.648s	0.436s	0.438s	0.462s	#5
Monte Carlo Pi	0.400s	0.374s	0.405s	1.473s	6.470s	🥇
N-Body Simulation	1.424s	1.596s	1.947s	2.283s	2.836s	🥈
Quicksort	0.170s	0.262s	0.184s	0.249s	0.204s	#5
SQLite	0.317s	0.365s	—	0.451s	0.350s	🥉
Sieve of Eratosthenes	0.029s	0.040s	0.035s	0.056s	0.052s	🥉
String Manipulation	0.008s	0.038s	0.016s	0.036s	0.027s	#5