Registers tick_triangle_escalation and apply_resolve_triangle systems in SimulationPlugin. Adds TriangleCrisisEventWire to ObserverSnapshot (protocol v16) for future client rendering of triangle crises (#250, D-087). Observer emits empty vec by default; escalation system will populate when triangles reach Active phase. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>