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Delete the hand-authored YAML content pipeline (server/src/content/) superseded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/tests/triangle_escalation.rs

@@ -13,7 +13,7 @@ use std::collections::BTreeMap;
 
 use bevy_ecs::{schedule::Schedule, world::World};
 use settled_reach_server::{
-    content::template::{
+    simulation::triangle::{
         apply_resolve_triangle, tick_triangle_escalation, ResolveTriangleCommand,
         ResolveTriangleQueue, TemplateId, TriangleClassification, TriangleCrisisEventQueue,
         TriangleDef, TriangleId, TrianglePhase, TriangleState,
@@ -56,7 +56,7 @@ fn spawn_triangle(
     tension: u8,
     tension_rate: u8,
     phase: TrianglePhase,
-    role_assignments: BTreeMap<settled_reach_server::content::template::RoleId, StableId>,
+    role_assignments: BTreeMap<settled_reach_server::simulation::triangle::RoleId, StableId>,
 ) -> bevy_ecs::entity::Entity {
     world
         .spawn((
@@ -135,7 +135,7 @@ fn simmering_transitions_to_active_at_expected_minute() {
     let npc_b = spawn_npc_with_threshold(&mut world, 2, 25); // lowest
     let npc_c = spawn_npc_with_threshold(&mut world, 3, 60);
 
-    use settled_reach_server::content::template::RoleId;
+    use settled_reach_server::simulation::triangle::RoleId;
     let mut assignments = BTreeMap::new();
     assignments.insert(RoleId::new("role-a"), npc_a);
     assignments.insert(RoleId::new("role-b"), npc_b);
@@ -185,7 +185,7 @@ fn d087_seed_dependent_escalation_timing() {
 
     let npc = spawn_npc_with_threshold(&mut world, 1, 30);
 
-    use settled_reach_server::content::template::RoleId;
+    use settled_reach_server::simulation::triangle::RoleId;
     let mut assignments = BTreeMap::new();
     assignments.insert(RoleId::new("r"), npc);
 
@@ -222,7 +222,7 @@ fn crisis_event_trigger_npc_is_lowest_threshold() {
     let npc_high = spawn_npc_with_threshold(&mut world, 1, 50); // high tolerance
     let npc_low = spawn_npc_with_threshold(&mut world, 2, 10);  // low tolerance — trigger
 
-    use settled_reach_server::content::template::RoleId;
+    use settled_reach_server::simulation::triangle::RoleId;
     let mut assignments = BTreeMap::new();
     assignments.insert(RoleId::new("r-high"), npc_high);
     assignments.insert(RoleId::new("r-low"), npc_low);
@@ -249,7 +249,7 @@ fn no_crisis_event_below_threshold() {
     let mut world = make_escalation_world();
     let npc = spawn_npc_with_threshold(&mut world, 1, 100); // high threshold
 
-    use settled_reach_server::content::template::RoleId;
+    use settled_reach_server::simulation::triangle::RoleId;
     let mut assignments = BTreeMap::new();
     assignments.insert(RoleId::new("r"), npc);
 
@@ -521,7 +521,7 @@ fn crisis_events_accumulate_until_drained() {
 
     let npc = spawn_npc_with_threshold(&mut world, 1, 5);
 
-    use settled_reach_server::content::template::RoleId;
+    use settled_reach_server::simulation::triangle::RoleId;
     let mut assignments = BTreeMap::new();
     assignments.insert(RoleId::new("r"), npc);
 
@@ -548,7 +548,7 @@ fn crisis_queue_drain_clears_events() {
 
     let npc = spawn_npc_with_threshold(&mut world, 1, 5);
 
-    use settled_reach_server::content::template::RoleId;
+    use settled_reach_server::simulation::triangle::RoleId;
     let mut assignments = BTreeMap::new();
     assignments.insert(RoleId::new("r"), npc);
 
@@ -575,7 +575,7 @@ fn crisis_queue_drain_clears_events() {
 /// (D-087) and those defs produce escalatable TriangleState instances.
 #[test]
 fn d087_all_v01_conflict_types_produce_escalatable_states() {
-    use settled_reach_server::content::template::{ConflictType, NpcAxis, RoleId};
+    use settled_reach_server::simulation::triangle::{ConflictType, NpcAxis, RoleId};
 
     let defs = [
         ("kael-davan", "smuggler", "ring-contact", ConflictType::ResourceCompetition),
@@ -587,7 +587,7 @@ fn d087_all_v01_conflict_types_produce_escalatable_states() {
 
     for (r0, r1, r2, conflict) in &defs {
         let roles = [RoleId::new(r0), RoleId::new(r1), RoleId::new(r2)];
-        let tid = settled_reach_server::content::template::TriangleId::from_seed_and_roles(42, &roles);
+        let tid = settled_reach_server::simulation::triangle::TriangleId::from_seed_and_roles(42, &roles);
         let def = TriangleDef {
             triangle_id: tid,
             roles: roles.clone(),