refactor(codegen): migrate 4 llvm-generator resolveExpressionType sites to typeOf()

[cs01]

Summary

• Migrates remaining 4 this.typeInference.resolveExpressionType(expr) call sites in llvm-generator.ts (global-var allocator paths at lines 2218, 2352, 2741, 2897) to the canonical this.typeOf(expr).
• Same pattern as PR refactor(codegen): migrate array-allocator to typeof() (phase-e step 5, pr2) #575 (array-allocator) and refactor(codegen): migrate class-allocator to typeof() (phase-e step 5, pr1) #576 (class-allocator) — hits the annotator cache first, falls through to the resolver for context-dependent types.
• Unblocked by PR fix(codegen): annotator only caches truly-static expression types; unblocks typeOf consumer migrations #580 which shrunk the annotator cache to truly-static types only.

User-facing effect

• No behavior change. Type answers are now consistent across codegen: one source of truth (typeOf) instead of direct resolver calls that might disagree with the cache.
• Continues the Phase-E "typed AST" convergence — eliminates the "two codegen sites ask at different moments and get different answers" class of silent-wrong bugs.

Test plan

• npm run verify — full tests + 3-stage self-host (stage 2 native oracle) green locally
• CI green

[github-actions]

Benchmark Results (Linux x86-64)

Benchmark	C	ChadScript	Go	Node	Place
Cold Start	0.8ms	0.8ms	1.2ms	25.6ms	🥇
Fibonacci	0.817s	0.762s	1.525s	3.171s	🥇
Hash Map Lookup	0.090s	0.062s	0.089s	0.110s	🥇
Binary Trees	1.350s	1.257s	2.713s	1.158s	🥈
File I/O	0.117s	0.090s	0.085s	0.199s	🥈
JSON Parse/Stringify	0.035s	0.049s	0.171s	0.132s	🥈
N-Body Simulation	1.664s	2.122s	2.203s	2.398s	🥈
Regex Match	0.017s	0.005s	0.021s	0.004s	🥈
SQLite	0.051s	0.366s	0.480s	0.411s	🥈
String Manipulation	0.008s	0.017s	0.017s	0.037s	🥈
Monte Carlo Pi	0.389s	0.410s	0.405s	2.249s	🥉
Quicksort	0.214s	0.246s	0.213s	0.261s	🥉
Sieve of Eratosthenes	0.014s	0.028s	0.018s	0.038s	🥉
Matrix Multiply	0.439s	0.670s	0.608s	0.372s	#4

CLI Tool Benchmarks

Benchmark	ChadScript	grep	node	xxd	Place
Hex Dump	0.553s	—	0.946s	0.130s	🥈
Recursive Grep	0.019s	0.009s	0.100s	—	🥈