fix native compiler class field initializers, add boolean[] tests

[cs01]

Summary

• Fix class field initializers in native compiler — class Foo { x: number = 42; } now works when compiled by the native compiler. Previously, field initializers were silently ignored, leaving fields at zero/null defaults.
• Root cause: classFields[fi] from an ObjectArray lost its ClassField type info in the native compiler, so cf.initializer read field index 0 (name) instead of index 3 (initializer). Fixed by adding as ClassField type assertions on ObjectArray element access.
• Un-skip class-field-init test — instance field initializers now pass with native compiler
• Un-skip switch-string-toplevel test — top-level string switch works correctly
• Add 4 boolean array test fixtures — validates boolean[] support (literals, push, index assignment, prime sieve)
• Normalize ClassField creation sites — all object literals now include all 5 fields upfront, preventing struct layout mismatches in the native compiler

Test plan

• npm run verify:quick passes (tests + self-hosting Stage 1)
• class-field-init.ts passes with native compiler (previously skipped)
• switch-string-toplevel.ts passes with native compiler (previously skipped)
• All 4 boolean array tests pass with native compiler
• Boolean array prime sieve produces correct primes up to 50

[github-actions]

Benchmark Results (Linux x86-64)

Benchmark	C	ChadScript	Go	Node	Bun	Place
Binary Trees	1.356s	1.204s	2.702s	1.175s	1.027s	🥉
Cold Start	0.8ms	0.8ms	1.2ms	23.8ms	8.7ms	🥇
Fibonacci	0.815s	1.472s	1.564s	3.164s	1.942s	🥈
File I/O	0.123s	0.093s	0.087s	0.207s	0.177s	🥈
JSON Parse/Stringify	0.004s	0.005s	0.017s	0.015s	0.007s	🥈
Matrix Multiply	0.488s	0.719s	0.573s	0.377s	0.340s	#5
Monte Carlo Pi	0.389s	0.410s	0.404s	2.249s	6.027s	🥉
N-Body Simulation	1.666s	2.120s	2.208s	2.386s	3.265s	🥈
Quicksort	0.215s	0.245s	0.213s	0.262s	0.226s	#4
SQLite	0.347s	0.399s	—	0.427s	0.411s	🥈
Sieve of Eratosthenes	0.016s	0.028s	0.018s	0.038s	0.036s	🥉
String Manipulation	0.008s	0.046s	0.017s	0.035s	0.027s	#5

CLI Tool Benchmarks

Benchmark	ChadScript	grep	node	xxd	Place
Hex Dump	0.436s	—	0.943s	0.135s	🥈
Recursive Grep	0.019s	0.009s	0.094s	—	🥈