sphinx-fix

Diagnose a failing Ray Sphinx / Read the Docs documentation build. Parses the Sphinx warning stream (an RtD build log, a local build, or pasted text), classifies each warning against a rules table, and proposes the canonical fix in severity-tier order. Detects a hard-broken build, segregates known-benign suppressed classes, and lists every unclassified warning. Use when a `docs/readthedocs.com:anyscale-ray` check fails, when asked "why is the docs build failing?" or "what warning is breaking this PR?", or to turn a Sphinx warning dump into an ordered fix list.