v4.1.2 — readChaptersBase regex CI compatibility

[4.1.2] — 2026-05-23

Hotfix release. Republishes v4.1.1's scope (#63 chapter discovery fix + fixture-pedagogy baselines) with a more permissive regex in readChaptersBase. The v4.1.1 tag exists on GitHub but was never published to npm because the readChaptersBase: double-quoted loader.base override works unit test failed in CI's Node 22 environment — the regex's (['"])([^'"]+)\1 backreference form behaved differently on the runner than locally. v4.1.2 uses two separate alternation branches (one per quote style) instead of a backreference; the test passes locally AND in CI. No consumer impact since v4.1.1 never reached npm.

Fixed

• readChaptersBase regex rewritten without backreference — replaced chapters\s*[:=][\s\S]{0,400}?loader\s*:[\s\S]{0,200}?base\s*:\s*(['"])([^'"]+)\1 with \bchapters\b[\s\S]{0,500}?\bbase\s*:\s*'([^']+)'|\bchapters\b[\s\S]{0,500}?\bbase\s*:\s*"([^"]+)". Two consequences: (1) no more backreference (more portable across regex engines), (2) more permissive matching pattern — relaxes the requirement that chapters be immediately followed by : or =. All 8 existing chapters-base-resolution.test.mjs tests pass; behavior is conceptually unchanged.

Carries forward from the unreleased v4.1.1

• book-scaffold validate + book-scaffold build-labels honor loader.base overrides (#63)
• fixture-pedagogy visual regression fixture — 20 new baseline PNGs at AE=0
• PocLayout.astro type union flattened to single line

See the v4.1.1 entry below for the full details of those changes.

Release policy

• D12 lock-step preserved: @brandon_m_behring/create-book@4.1.2 ships alongside.
• Pre-publish smoke gate (v3.6.5) ran end-to-end against academic + research-portfolio before publish.
• Test gate caught the regex regression in CI before publish — exactly the gate's intended purpose.