[simonvanlierde]

Two badge cases still ended up in a project's summary after #17.

• Reference-style badge rows like [![CI][ci-badge]][ci] ![Cov][cov] weren't recognised. They are now, and so are their [ci-badge]: https://… definition lines; without that, a definition line became the summary once the badge row was skipped. A link inside a sentence, like See [a][b] for more., stays.
• A badge URL with parentheses, like https://x/w_(a).svg, didn't match. URLs may now hold one level of parentheses.
• Brackets still stay out of alt text, labels and URLs, so every match attempt stops at the next bracket and matching stays linear. Crafted 100,000-character lines take under 1 ms.

Tests: the reference-badge test failed before the fix, with the badge row as the summary. A new test runs CodeQL's earlier backtracking input and three other crafted lines, each under 100 ms. npm run check && npm run lint && npm test && npm run build exits 0 (24 tests). URLs with nested parentheses, like a_(b_(c)), are still not recognised.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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