Analyzes assign lifecycle patterns.

Detects assigns that are set once and never change ("dead state"). These may indicate unused data being carried in socket assigns.

Uses key_state from timeline events to track which assigns change.

Output

%{
  findings: [
    %{
      severity: :info,
      message: "2 assign(s) never changed: [:static_config, :user_id]",
      events: [],
      metadata: %{stale_assigns: [:static_config, :user_id]}
    }
  ],
  stats: %{
    total_assigns: 5,
    active_assigns: 3,
    stale_assigns: 2
  }
}