* The interpreter wasted cycles on unnecessary async/Promise wrapping
and redundant allocations even for synchronous operations.
* Now: more "sync-first" evaluation — try the fast synchronous path
first, only fall back to Promises when actually needed.
* In addition: fast paths for table access, variable lookups, string
concat, arithmetic, and function calls; loops can re-enter sync mode
after an async iteration resolves.
* Added benchmarks
Results: 1.3x–1.7x speedup across typical workloads (API calls, table
traversal, string ops), up to 1.92x in some cases.
* Add result-or-promise (RP) exec model to interpreter (async-first).
* Add centralized table property access with fast misses.
* Update table string keys to be object map.
* Update error contexts to be more consistent and precise.
* Update evaluator to return either values or _Promises_.
* Update func calls, unary and bin operations, and expression lists.
* Update _stdlib_ to the changes and improve errors.
* Add tests to validate async control flow and error contexts.
* Add dedicated benches that isolate the _runtime_ from parsing.
Zef Hemel