Build: state=Finished  success=False  exit=1  build finished with problems, 1 warning.

Findings (1):
  Tier 2 — structural/parse (fix first; these mask warnings beneath them):
    [T2] toctree-nonexisting  doc/source/index.md:12
          msg:    toctree contains reference to nonexisting document 'ray-contribute/old-name'
          fix:    Fix the toctree entry (entries are extensionless) to the current document name, or remove it.
          safety: mechanical

Unclassified (0) — no rule matched; resolve with the user, then file a skill-improvement ticket to add a rule:

Suppressed (0) — known-benign, not actionable:

Next: fix Tier 2 first (it masks others), then rebuild and re-run — do not assume one pass is complete.
