- Add estrlist.ct: string list operations with @awk acceleration
- Add estrlist_noawk.ct: pure bash version for comparison
- Add benchmark.sh: performance comparison script
- Add BENCHMARK.md: results showing @awk gives 93x speedup on union

Codegen fixes:
- Fix time.now() and time.ms() calls in dispatch_codegen
- Fix math.* namespace calls
- Previous fixes for class field assignment and nested constructors