- Add error capture scope to orelseCatchExpr (catch |err| now creates
a ScopeLocalVal for the captured error variable)
- Add @panic, @errorName, @field builtins
- Increase blockExprStmts scope arrays from 64 to 128 entries
(build.zig has 93 var decls in a single block)
corpus build.zig still skipped: needs switchExprErrUnion optimization
(catch |err| switch(err) pattern).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>