refactor(codegen): migrate class-allocator to typeof() (phase-e step 5, pr1)

[cs01]

Summary

• Swaps ctx.resolveExpressionType(stmt.value) for ctx.typeOf(stmt.value) in the class-allocator ternary branch.
• Routes through the pre-populated annotator cache first, falling through to the memoized resolver only for expression shapes the annotator skipped.

User impact

• No behavior change. Slightly faster class allocation on ternary initializers that the annotator already typed.

Test plan

• npm run verify (full, stage 2 included) green locally.

[github-actions]

Benchmark Results (Linux x86-64)

Benchmark	C	ChadScript	Go	Node	Place
Cold Start	0.8ms	0.6ms	1.0ms	27.0ms	🥇
Fibonacci	0.725s	0.722s	1.434s	2.842s	🥇
Hash Map Lookup	0.112s	0.064s	0.103s	0.153s	🥇
Matrix Multiply	0.436s	0.406s	0.453s	0.456s	🥇
Monte Carlo Pi	0.400s	0.381s	0.406s	1.474s	🥇
Regex Match	0.013s	0.004s	0.020s	0.005s	🥇
JSON Parse/Stringify	0.032s	0.044s	0.172s	0.134s	🥈
N-Body Simulation	1.434s	1.852s	1.948s	2.298s	🥈
SQLite	0.048s	0.334s	0.469s	0.448s	🥈
Sieve of Eratosthenes	0.031s	0.042s	0.043s	0.057s	🥈
Binary Trees	1.355s	1.400s	2.924s	1.318s	🥉
File I/O	0.071s	0.073s	0.072s	0.231s	🥉
Quicksort	0.170s	0.216s	0.183s	0.248s	🥉
String Manipulation	0.008s	0.017s	0.016s	0.035s	🥉

CLI Tool Benchmarks

Benchmark	ChadScript	grep	node	xxd	Place
Hex Dump	0.477s	—	1.042s	0.070s	🥈
Recursive Grep	0.013s	0.008s	0.103s	—	🥈