sphinx-fix

1Build: state=Finished  success=False  exit=1  build finished with problems, 1 warning.2 3Findings (1):4  Tier 3 — warnings:5    [T3] intersphinx-inventory-unreachable  (no location)6          msg:    failed to reach any of the inventories with the following issues:7          fix:    Check that doc/source/_intersphinx/<project>.inv exists and is committed (it should start with the bytes '# Sphinx inventory version'). If it is missing, that is the defect -- run `python doc/source/_intersphinx/refresh.py <project>` and commit it. If the snapshot is present and intact, the local read itself failed (permissions, a bad exclude_patterns change, or the file was truncated); re-check the snapshot before blaming the network. Only if the project is absent from _intersphinx_targets is the upstream URL in conf.py the thing to confirm. This is not a per-page content fix.8          safety: judgment (needs your call)9 10Unclassified (0) — no rule matched; resolve with the user, then file a skill-improvement ticket to add a rule:11 12Suppressed (0) — known-benign, not actionable:13 14Next: apply the fixes above, then rebuild and re-run to confirm clean.15