refactor(codegen): migrate member.ts to typeOf()

[cs01]

Summary

• Migrates 2 this.ctx.resolveExpressionTypeRich(...) call sites in member.ts (indexed-object-array element info at line 2233, optional-chain through method-call/call returning named interfaces at line 2890) to the canonical this.ctx.typeOf(...).
• Renames the MemberAccessGeneratorContext interface member from resolveExpressionTypeRich to typeOf.
• Closes out non-type-inference consumer migrations for Phase-E step 5. Remaining resolveExpressionTypeRich callers are the type-annotator itself (sink of the cache) and internal typeInference recursion.

User-facing effect

• No behavior change. Single canonical type lookup across codegen for member access. Eliminates the "annotator cache says one thing, on-demand resolver says another" silent-wrong class across all member-access paths.

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	0.7ms	0.6ms	1.1ms	26.2ms	🥇
Fibonacci	0.725s	0.722s	1.430s	2.840s	🥇
Hash Map Lookup	0.104s	0.065s	0.095s	0.137s	🥇
Monte Carlo Pi	0.402s	0.387s	0.406s	1.474s	🥇
JSON Parse/Stringify	0.032s	0.045s	0.172s	0.134s	🥈
Matrix Multiply	0.448s	0.459s	0.473s	0.481s	🥈
N-Body Simulation	1.425s	1.853s	1.946s	2.272s	🥈
Regex Match	0.014s	0.004s	0.020s	0.004s	🥈
SQLite	0.046s	0.333s	0.464s	0.436s	🥈
Binary Trees	1.362s	1.407s	3.012s	1.385s	🥉
File I/O	0.076s	0.077s	0.076s	0.241s	🥉
Quicksort	0.169s	0.215s	0.183s	0.248s	🥉
Sieve of Eratosthenes	0.031s	0.041s	0.038s	0.058s	🥉
String Manipulation	0.008s	0.021s	0.016s	0.036s	🥉

CLI Tool Benchmarks

Benchmark	ChadScript	grep	node	xxd	Place
Hex Dump	0.484s	—	0.998s	0.068s	🥈
Recursive Grep	0.012s	0.008s	0.101s	—	🥈