test(network-diagnostics): align tests with shared news-prewarm composite action

[Copilot]

14 assertions in tests/network-diagnostics.test.ts failed after PR #2008 extracted the inline pre-flight/pre-warm YAML from every news-*.md workflow into the shared composite action .github/actions/news-prewarm/action.yml. The tests still grepped each workflow file for literals (Pre-flight external endpoint reachability check, DNS Resolution Tests, …) that now live only in the action.

Test-only change — workflows and the action are correct as merged.

Changes — tests/network-diagnostics.test.ts

• New constants NEWS_PREWARM_ACTION and NEWS_PREWARM_USES_REF to point at the shared action.
• Pre-flight External Reachability Check — assert the action exists, uses the clarified step name (not the legacy Network and MCP diagnostics), carries the canonical diagnostics content (DNS / HTTPS / MCP tool count), and probes every entry in REQUIRED_MCP_DOMAINS. Every workflow must wire uses: ./.github/actions/news-prewarm in its frontmatter steps:.
• In-Prompt MCP Gateway Diagnostics — keep the get_sync_status + safeoutputs___noop health-gate assertions on the effective prompt surface; replace the per-workflow inline pre-flight grep with the uses: reference check, and assert the Render MCP endpoint is probed inside the action.
• Pre-warm and Keep-alive Patterns — pre-warm literal lookup moves from news-propositions.md to the action; per-workflow check accepts the uses: wiring as a valid pre-warm signal.
• Step Ordering Awareness — frontmatter assertion is now "wires the shared action" rather than "contains the inline literal".

// before
expect(fm).toContain('Pre-flight external endpoint reachability check');

// after
expect(fm).toContain(`uses: ${NEWS_PREWARM_USES_REF}`);
// ...and the literal is asserted once, against the action file:
const action = fs.readFileSync(NEWS_PREWARM_ACTION, 'utf-8');
expect(action).toContain('Pre-flight external endpoint reachability check');

[github-actions]

🏷️ Automatic Labeling Summary

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

Applied Labels: testing,size-m

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

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🔍 Lighthouse Performance Audit

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

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[Copilot]

Pull request overview

Updates the network-diagnostics test suite to reflect the post-#2008 architecture where pre-warm + pre-flight diagnostics moved from inline workflow YAML into the shared composite action .github/actions/news-prewarm/action.yml.

Changes:

• Add constants to reference the shared news-prewarm composite action path and the uses: wiring string.
• Move diagnostics literal assertions (step names, DNS/HTTPS/tool-count checks, required domain probes) from per-workflow greps to a single assertion against the composite action file.
• Update workflow assertions to verify frontmatter steps: wires uses: ./.github/actions/news-prewarm, while keeping effective-prompt health-gate checks (get_sync_status, safeoutputs___noop) intact.