feat(simulation): add social site template schema types

Implements #163 (RoleSchema), #164 (SpaceSpec), #165 (TemplateOwnership
+ TemplateReferenceMap), #106 (TriangleDef), #107 (intra-template
triangle generation), and #250 (triangle escalation system) as the
foundational Tier 2 template system per D-025.

New content/template module with YAML-deserializable schema types,
ECS components for ownership/triangle state, escalation system
running on game-minute boundaries, and TriangleCrisisEvent emission.
Sample YAML templates at server/data/templates/.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/content/mod.rs

@@ -14,6 +14,7 @@ pub mod hot_reload;
 pub mod line_pool;
 pub mod loader;
 pub mod spawn;
+pub mod template;
 pub mod types;
 
 use bevy_app::prelude::*;