refactor(simulation): remove v0.1 content loading system (#655)

Delete the hand-authored YAML content pipeline (server/src/content/) superseded
by the v0.2 generator-first approach (D-122, D-128). Runtime ECS types that were
co-located with content loading have been extracted to dedicated simulation modules:

- simulation/triangle.rs: TriangleState, TriangleCrisisEventQueue, tick/resolve systems
- simulation/line_pool.rs: LinePoolIndex, AccessTier, TrustTier, Mood, LinePoolIndexResource
- simulation/knowledge_grant.rs: KnowledgeGrant, Prerequisites

Monologue systems (trigger_monologue, trigger_recognition_monologue,
trigger_event_monologue) now use hardcoded fallback lines only; the
ContentStoreResource branch and select_pool_line function are removed.

Deleted: content/{loader,types,line_pool,hot_reload,spawn,instantiation,entanglement,mod}.rs
Deleted: tests/{content_loading,content_runtime,content_scaling,template_instantiation,template_schema}.rs
Deleted: bin/line_preview.rs (v0.1 tool)

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

server/src/storyteller/mod.rs

@@ -55,7 +55,7 @@ use bevy_app::prelude::*;
 use bevy_ecs::prelude::*;
 use rand::Rng;
 
-use crate::content::template::{TriangleClassification, TriangleId, TrianglePhase, TriangleState};
+use crate::simulation::triangle::{TriangleClassification, TriangleId, TrianglePhase, TriangleState};
 use crate::knowledge::EntityRegistry;
 use crate::npc::Npc;
 use crate::simulation::movement::{PlayerCharacter, TilePosition};
@@ -691,7 +691,7 @@ pub fn expire_routine_deviations(
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::content::template::{
+    use crate::simulation::triangle::{
         RoleId, TemplateId, TriangleClassification, TriangleId, TrianglePhase, TriangleState,
     };
     use crate::knowledge::types::StableId;