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Delete the hand-authored YAML content pipeline (server/src/content/) superseded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

@@ -8,7 +8,6 @@
 use bevy_app::prelude::*;
 use std::io::{BufReader, BufWriter};
 use std::net::{TcpListener, TcpStream};
-use std::path::PathBuf;
 use std::thread;
 use std::time::{Duration, Instant};
 
@@ -16,7 +15,7 @@ use settled_reach_server::bridge::framing::{read_framed, write_framed};
 use settled_reach_server::bridge::tcp::TcpBridge;
 use settled_reach_server::bridge::types::*;
 use settled_reach_server::bridge::{BridgePlugin, BridgeResource};
-use settled_reach_server::content::{ContentConfig, ContentPlugin};
+use settled_reach_server::simulation::line_pool::{LinePoolIndex, LinePoolIndexResource};
 use settled_reach_server::knowledge::registry::EntityRegistry;
 use settled_reach_server::knowledge::KnowledgeGraph;
 use settled_reach_server::perception::cognitive_delay::CognitiveDelay;
@@ -34,10 +33,6 @@ const WARMUP_TICKS: usize = 5;
 const MEASURE_TICKS: usize = 50;
 const TOTAL_TICKS: usize = WARMUP_TICKS + MEASURE_TICKS;
 
-fn content_root() -> PathBuf {
-    let manifest_dir = env!("CARGO_MANIFEST_DIR");
-    PathBuf::from(manifest_dir).join("../content")
-}
 
 fn read_rss_kb() -> Option<u64> {
     std::fs::read_to_string("/proc/self/status")
@@ -64,17 +59,10 @@ fn read_rss_kb() -> Option<u64> {
 #[test]
 #[ignore]
 fn perf_tick_timing() {
-    let root = content_root();
-    if !root.join("content.yaml").exists() {
-        eprintln!("Skipping: content directory not found at {:?}", root);
-        return;
-    }
-
     let listener = TcpListener::bind("127.0.0.1:0").expect("bind listener");
     let server_addr = listener.local_addr().expect("get local addr");
 
-    // Server thread: full plugin stack with real content, timed ticks
-    let server_root = root.clone();
+    // Server thread: full plugin stack, timed ticks
     let server_handle = thread::spawn(move || -> Vec<Duration> {
         let bridge = TcpBridge::accept_on(listener).expect("accept connection");
 
@@ -83,11 +71,7 @@ fn perf_tick_timing() {
         app.add_plugins(BridgePlugin);
         app.add_plugins(settled_reach_server::knowledge::KnowledgePlugin);
         app.add_plugins(settled_reach_server::npc::NpcPlugin);
-        app.insert_resource(ContentConfig {
-            content_root: server_root,
-            ..Default::default()
-        });
-        app.add_plugins(ContentPlugin);
+        app.insert_resource(LinePoolIndexResource(LinePoolIndex::default()));
         app.insert_resource(BridgeResource::new(bridge));
         app.insert_resource(WalkabilityMap::new(32, 32, 1));