The last 1%: 7 branches scored 99% in CI while 100% locally. Root cause proven
by reproducing CI's exact path (tracked-only tree + real .git): .gitignore
dir-only patterns (trailing slash — logs/, **/*_json/, .trinity/) do NOT match
via 'git check-ignore <bare-path>' when the path is absent from disk (clean
checkout), because git cannot infer 'directory' to apply a dir-only pattern.
The working tree has those dirs on disk, so it matched there — the exact
working-tree-vs-clean-checkout divergence.
_is_gitignored now also tests the trailing-slash form; all 7 readme failures
(cli_json/logs/artifacts/.trinity/ etc flagged 'missing on disk') clear.
Regression test builds a real git repo with dir-only patterns + non-existent
paths. CI gate also now prints failing standards + check messages (says WHY).
Verified: clean tree w/ real .git 13/13 100%; working tree 13/13 100%; seedgo
1053 tests green; pyright 0.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
