newOS4 - the browser terminal that runs WebX11 user spaces https://newos.webx11.duckdns.org/newos4/atom?h=main 2026-10-23T17:29:31+00:00 2026-10-23T17:29:31+00:00 Agando roduccomm@gmail.com 2026-10-23T17:29:31+00:00 urn:sha1:0d2365ab202ba5c9b1d0604467af0594dc7360de - api/chat/{lib,post,poll}.php: thread = sha256(token)[0:16]; flock read-modify-write; tmp+rename; ms epoch cursor; per-thread + per-IP windows with retry_after_ms; 401/413/507/405 carry a machine code, only rate_limited is retryable - _docs/chat-contract.md: frozen shapes, incl. why the cursor is ms and not ts - scripts/chat.py: list/show/reply, UTC, locked, atomic replace - api/debug/agent-replies.php POST -> 410 Gone with pointers (one write path) Measured: 401 no-token, 201+id, poll 1 msg, poll>since 1 new, data/chat 403, 4001 chars 413 (codepoints), 429 with Retry-After 576, round trip via chat.py.