- decompose monolithic runtime code (notably `src/ant.c`) into focused subsystems for errors, GC, runtime, REPL, ESM, bytecode execution, and module-specific paths - add/extend built-in modules and headers (date, dns, module, napi, net, regex, tty, util, worker_threads, async_hooks, and related runtime wiring) - land bytecode evaluation/entry-path improvements and integrate JIT execution scaffolding into the refactored runtime flow - update public/internal headers and runtime APIs to match the new architecture - remove legacy stack unit (`include/stack.h`, `src/stack.c`) and migrate behavior into the refactored runtime - refresh build/package integration (meson deps/options, package metadata, zig pkg tooling, vendor wraps/packagefiles) for the new layout - update examples/specs/type declarations and broaden regression/perf/GC/JIT coverage BREAKING CHANGE: internal runtime structure and several internal interfaces were reorganized; out-of-tree integrations depending on prior layout must be updated.