nx_js_compile.nx

nx_js_compile.nx -- the bytecode-VM PARITY GATE (rungs 2..5c): every chk() runs the SAME source through the TREE-WALKER (js_run_source) and the VM (compile_run in nx_js_vm.nx) and requires identical rc AND deep-equal values; chk_read() = the async read-after-drain twin. The VM library lives in nx_js_vm.nx so other organs (nx_js_sota_bench) reuse it without duplicating the engine. license_tier: ORIGINAL