feat(simulation): wire triangle escalation and crisis events into protocol

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>

server/src/perception/observer/mod.rs

@@ -414,6 +414,7 @@ pub fn compute_observer_snapshot(
         examine_result,
         player_knowledge,
         save_result,
+        triangle_crisis_events: vec![],
     });
 }