Strip English Executive Brief carrier so it no longer leaks into the article TOC

[Copilot]

An executive-brief_en.md artifact is embedded by the aggregator as a ## Executive Brief En carrier heading. Because the lead-localizer's suffix list excluded English, that carrier survived into the rendered output and leaked into both the in-article TOC and body — visible in the committed 2026-05-15/propositions build (the only subfolder with this artifact), not just single-language isolation.

Root cause

• stripEmbeddedLocalizedBriefSections (article-brief-lead.ts) strips ## Executive Brief <Lang> carriers, but LOCALIZED_BRIEF_TITLE_SUFFIXES was built from LANGUAGES.filter((l) => l !== 'en').
• The unstripped <h2 id="rm-executive-brief-en"> has no slug localization, so generateArticleToc falls back to raw text "Executive Brief En" → TOC leak (and a duplicate brief body section).

Changes

• scripts/render-lib/article-brief-lead.ts — include all 14 languages (English included) in LOCALIZED_BRIEF_TITLE_SUFFIXES. The \b boundary in EMBEDDED_BRIEF_SECTION_RE still preserves the legacy unsuffixed ## Executive Brief / ## What Happened canonical lead. JSDoc updated to explain the English inclusion.
• tests/article-brief-lead.test.ts — regression tests for (a) stripping a stray ## Executive Brief En carrier, (b) preserving the legacy unsuffixed lead, (c) the English render-path stripping the En carrier while keeping the canonical lead.
• news/2026-05-15-propositions-*.html (14 languages) — regenerated; the leaked TOC entry and duplicate carrier section are removed while the canonical What Happened lead is preserved.

// before: English excluded → "## Executive Brief En" never stripped
const LOCALIZED_BRIEF_TITLE_SUFFIXES = LANGUAGES.filter((l) => l !== 'en').map(/* … */);
// after: all langs, incl. English
const LOCALIZED_BRIEF_TITLE_SUFFIXES = LANGUAGES.map(/* … */);

Notes

• TOC section-title localization coverage was audited as part of "improve all" — every SECTION_TITLES slug resolves through localizedSectionTitle (0 uncovered), so no additional i18n gaps remain.
• A pre-existing mermaid-coverage-regression on the unmodified 2026-05-15/propositions/article.md is unrelated to this change.

[github-actions]

🏷️ Automatic Labeling Summary

This PR has been automatically labeled based on the files changed and PR metadata.

Applied Labels: testing,refactor,size-l

Label Categories

• 🗳️ Content: news, dashboard, visualization, intelligence
• 💻 Technology: html-css, javascript, workflow, security
• 📊 Data: cia-data, riksdag-data, data-pipeline, schema
• 🌍 I18n: i18n, translation, rtl
• 🔒 ISMS: isms, iso-27001, nist-csf, cis-controls
• 🏗️ Infrastructure: ci-cd, deployment, performance, monitoring
• 🔄 Quality: testing, accessibility, documentation, refactor
• 🤖 AI: agent, skill, agentic-workflow

For more information, see .github/labeler.yml.

[github-actions]

🔍 Lighthouse Performance Audit

Category	Score	Status
Performance	85/100	🟡
Accessibility	95/100	🟢
Best Practices	90/100	🟢
SEO	95/100	🟢

📥 Download full Lighthouse report

Budget Compliance: Performance budgets enforced via budget.json

[github-actions]

🔍 Lighthouse Performance Audit

Category	Score	Status
Performance	85/100	🟡
Accessibility	95/100	🟢
Best Practices	90/100	🟢
SEO	95/100	🟢

📥 Download full Lighthouse report

Budget Compliance: Performance budgets enforced via budget.json

[github-actions]

🔍 Lighthouse Performance Audit

Category	Score	Status
Performance	85/100	🟡
Accessibility	95/100	🟢
Best Practices	90/100	🟢
SEO	95/100	🟢

📥 Download full Lighthouse report

Budget Compliance: Performance budgets enforced via budget.json

[Copilot]

Pull request overview

This PR fixes an edge case in the article lead localization pipeline where an embedded executive-brief_en.md artifact could survive as a ## Executive Brief En carrier and leak into the rendered article body and in-article TOC. The change makes carrier stripping include English suffixes while preserving the legacy unsuffixed ## Executive Brief lead heading.

Changes:

• Update carrier-stripping logic to treat Executive Brief En as a removable embedded carrier section (same as other localized carriers).
• Add regression tests covering (a) stripping the English carrier, (b) preserving the legacy unsuffixed heading, and (c) English render-path behavior.
• Regenerate affected news/2026-05-15-propositions-*.html outputs to remove the leaked TOC entry and duplicated carrier section.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
scripts/render-lib/article-brief-lead.ts	Includes English in localized brief suffix matching so Executive Brief En carriers are stripped without impacting the canonical/legacy lead headings.
tests/article-brief-lead.test.ts	Adds regression coverage for stripping Executive Brief En while preserving canonical/legacy lead behavior.
tests/section-title-i18n.test.ts	Expands TOC localization coverage assertions for additional mapped slugs and adds targeted regression expectations.
news/2026-05-15-propositions-en.html	Regenerated to remove leaked Executive Brief En TOC entry/body section and update timestamps.
news/2026-05-15-propositions-sv.html	Regenerated to remove leaked Executive Brief En TOC entry/body section and update timestamps.
news/2026-05-15-propositions-da.html	Regenerated to remove leaked Executive Brief En TOC entry/body section and update timestamps.
news/2026-05-15-propositions-no.html	Regenerated to remove leaked Executive Brief En TOC entry/body section and update timestamps.
news/2026-05-15-propositions-de.html	Regenerated to remove leaked Executive Brief En TOC entry/body section and update timestamps.
news/2026-05-15-propositions-fr.html	Regenerated to remove leaked Executive Brief En TOC entry/body section and update timestamps.
news/2026-05-15-propositions-es.html	Regenerated to remove leaked Executive Brief En TOC entry/body section and update timestamps.
news/2026-05-15-propositions-nl.html	Regenerated to remove leaked Executive Brief En TOC entry/body section and update timestamps.
news/2026-05-15-propositions-ar.html	Regenerated to remove leaked Executive Brief En TOC entry/body section and update timestamps.
news/2026-05-15-propositions-he.html	Regenerated to remove leaked Executive Brief En TOC entry/body section and update timestamps.
news/2026-05-15-propositions-ja.html	Regenerated to remove leaked Executive Brief En TOC entry/body section and update timestamps.
news/2026-05-15-propositions-ko.html	Regenerated to remove leaked Executive Brief En TOC entry/body section and update timestamps.
news/2026-05-15-propositions-zh.html	Regenerated to remove leaked Executive Brief En TOC entry/body section and update timestamps.