Backend:
- technique_query_service.get_technique_detail() now queries DetectionRule
by mitre_technique_id == mitre_id (same field the heatmap uses)
- Rules sorted: critical → high → medium → low → informational, then alphabetically
- Returns: id, title, description, source, source_url, rule_format,
severity, platforms, false_positive_rate
Frontend:
- New DetectionRulesSection component with expandable rows per rule
- Color-coded severity dots and badges (red/orange/yellow/blue/gray)
- Source badges (sigma=purple, elastic=blue, splunk=orange, custom=cyan)
- Shows format, false positive rate, platforms, source link on expand
- Empty state when no rules exist
Fixes: T1189 showed green in heatmap but no rules on detail page
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
