refactor(codegen): delete dead resolveExpressionType public passthrough on LLVMGenerator

[cs01]

Summary

• Deletes the public resolveExpressionType(expr) passthrough on LLVMGenerator (was llvm-generator.ts:4246-4248). After refactor(codegen): migrate member.ts to typeOf() #594 migrated the last external consumer (member.ts), this method had zero callers.
• resolveExpressionTypeRich passthrough stays — it's the TypeAnnotatorSink method the pre-codegen annotator calls to fill the typeOf cache.

User-facing effect

• No behavior change. Shrinks the LLVMGenerator public API surface. One fewer way to bypass the canonical typeOf() lookup.

Part of Phase-E convergence

• Umbrella issue: Phase-E typed-AST: converge 4 resolvers into canonical typeOf() #595.

Test plan

• npm run verify — full tests + 3-stage self-host green locally
• CI green

[github-actions]

Benchmark Results (Linux x86-64)

Benchmark	C	ChadScript	Go	Node	Place
Cold Start	1.3ms	0.9ms	1.3ms	29.4ms	🥇
Fibonacci	0.818s	0.764s	1.563s	3.181s	🥇
File I/O	0.119s	0.090s	0.091s	0.209s	🥇
Hash Map Lookup	0.097s	0.063s	0.091s	0.113s	🥇
Binary Trees	1.388s	1.297s	2.745s	1.182s	🥈
JSON Parse/Stringify	0.035s	0.051s	0.172s	0.135s	🥈
N-Body Simulation	1.668s	2.120s	2.205s	2.379s	🥈
Regex Match	0.016s	0.005s	0.021s	0.004s	🥈
SQLite	0.051s	0.371s	0.496s	0.492s	🥈
Monte Carlo Pi	0.389s	0.410s	0.405s	2.248s	🥉
Quicksort	0.214s	0.248s	0.213s	0.263s	🥉
Sieve of Eratosthenes	0.016s	0.029s	0.021s	0.038s	🥉
String Manipulation	0.008s	0.019s	0.016s	0.037s	🥉
Matrix Multiply	0.444s	0.716s	0.578s	0.486s	#4

CLI Tool Benchmarks

Benchmark	ChadScript	grep	node	xxd	Place
Hex Dump	0.557s	—	1.001s	0.132s	🥈
Recursive Grep	0.020s	0.010s	0.102s	—	🥈