Detects unnecessary component re-renders.

When components are present and renders fire without assign changes, child components are likely re-rendering unnecessarily.

Thresholds

• Warning: 3+ wasted renders with components present
• Critical: >50% of renders wasted with components present

Output

%{
  findings: [%{
    severity: :warning,
    message: "4 stable components across 8 renders, but only 2 had assign changes...",
    events: [3, 4, 6, 7, 8],
    metadata: %{component_count: 4, wasted_renders: 5, total_renders: 7}
  }],
  stats: %{render_efficiency: 0.29}
}