Neko.js v1.6.1

• Performance: on Node, each pinned ONNX payload file is hashed once per installed runtime instead of four times per load (prefetch plus three loader requests); unchanged files are recognised by device, inode, size, mtime and ctime, and new processes still verify every byte. Measured warm model load fell from about 2.3 s to about 1.3 s on macOS arm64. The cache no longer calls chmod on files that already have mode 0600, which would have advanced ctime.
• Performance: Node ONNX sessions now use os.availableParallelism() intra-op threads. On a 4 performance + 6 efficiency core Apple machine this raised prefill about 25% (about 213-238 to about 290 tokens/s) and lowered decode about 12% (about 28 to about 25 tokens/s); the best value depends on hardware.
• Performance: structured calls reuse an engine-private decoder state for their fixed system instruction (text-only, at least 32 tokens, no explicit reuse). Time to first token for a 115-token structured prompt fell from about 460-540 ms to about 130-160 ms on a hit, with identical output in the exercised cases. reuseCacheInfo() gains prefixEntries, prefixBytes, prefixHits and prefixMisses.
• Performance: the constrained-decoding token trie uses typed arrays; building it for the 248,056-piece vocabulary took about 270 ms (was about 337 ms) and about 54 MB of external/array-buffer memory instead of about 230 MB of JavaScript heap.