sim-lib-lang-javascript

Embedded, capability-scoped ECMAScript over lowered codec/javascript forms. It evaluates directly and composes SIM's shared organs, installed Number/BigInt domains, managed arena, and collector. Jobs run only at an explicit bounded drain-to-empty checkpoint. It is not a compiler, VM, Node adapter, Realm engine, DOM, timer service, ambient host-IO surface, or host event loop.

The public fidelity inventory scores syntax, lowering, direct evaluation, objects, intrinsics, jobs/modules, boundedness, and expected gaps independently. Its regression inventory names the checked descriptor, cycle, completion, collection, job, module, RegExp, UTF-16, and capability-refusal specimens.

Standard-core boundary

The checked manifest is generated from intrinsics.tsv; every admitted constructor, namespace, prototype, and method names its canonical backing. Arrays (including holes), iterators, Map, Set, and Symbol are JavaScript policy over the sequence and mutation organs. Strings use a distinct UTF-16 code-unit face, so indexing, slicing, and iteration preserve lone surrogates while conversion to canonical scalar SIM text fails closed on an unpaired surrogate. JSON parsing and encoding pass through sim-codec-json, with JavaScript-owned reviver, toJSON, replacer, integer-key-first property order, undefined, and cycle-rejection policy around that canonical owner.

RegExp literals parse, but v1 executes only this intersection with the bounded pattern organ: literals, ., ^/$, simple and negated character classes, ASCII \d/\s/\w complements, and greedy or lazy ?, *, and +. Every flag (d g i m s u v y), alternation, groups, backreferences, lookaround, Unicode property/set syntax, word-boundary assertions, and counted quantifiers is rejected, never approximated. JAVA_SCRIPT_6 pattern-engine work is the first JavaScript successor requirement; until then this is deliberately not a general ECMAScript RegExp implementation.