Eight explainers are still listed as known exceptions in the structure check #1130

Where: scripts/check_explainer_structure.py (KNOWN_EXCEPTIONS), explainers/neural-networks.md, sampling-bias.md, differential-privacy.md, disparate-impact.md, fairness-metric-conflicts.md, shap-values.md, how-ai-detects-patterns.md, predictive-parity.md.

Current gap: the structure check lets each of these eight pages lack one thing CONTRIBUTING.md asks of every explainer: a Detection Code section (neural-networks, disparate-impact, fairness-metric-conflicts, shap-values), a Related Concepts section (sampling-bias, which has "Relationship to Other Concepts"), a Concrete Example (differential-privacy), or the standard section order (how-ai-detects-patterns, predictive-parity). The check fails if an exception becomes stale, so each fix also removes its entry.

Repro: sed -n '/KNOWN_EXCEPTIONS/,/^}/p' scripts/check_explainer_structure.py

Suggested approach: fix the pages one by one: add a short runnable detection block with real output to the four that lack it, rename or add the heading where it is only named differently, add a concrete example from one of the audits to differential-privacy, and reorder the two with the wrong order. Use only numbers the code prints, and rebuild.

Done when: KNOWN_EXCEPTIONS is empty (or deleted), make lint passes, and the generated pages are rebuilt.