refactor: drop spent ablation knobs from perf spike, trim ADR-0002 consequences

examples/perf_spike.rs

@@ -16,8 +16,6 @@
 //!   PERF_N           enemy population held constant            (default 1000)
 //!   PERF_FIRE_RATE   tower shots per second                    (default 20)
 //!   PERF_RENDER      1 = window + sprites, 0 = headless logic   (default 1)
-//!   PERF_COLLIDE     1 = run naive O(n*m) collision            (default 1)
-//!   PERF_MOVE        1 = run enemy movement                    (default 1)
 //!   PERF_SECONDS     length of the measurement window          (default 12)
 //!   PERF_WARMUP      seconds discarded before measuring        (default 4)
 //!
@@ -48,7 +46,7 @@ const HIT_RADIUS: f32 = 10.0;
 /// An enemy this close to the centre has "arrived" and is recycled to the rim.
 const CENTER_RADIUS: f32 = 24.0;
 /// Enough history to hold every frame of a long run at high fps.
-const HISTORY: usize = 120_000;
+const HISTORY: usize = 20_000;
 
 const D_MAINTAIN: DiagnosticPath = DiagnosticPath::const_new("spike/maintain_us");
 const D_MOVE_ENEMIES: DiagnosticPath = DiagnosticPath::const_new("spike/move_enemies_us");
@@ -64,8 +62,6 @@ struct SpikeConfig {
     enemy_count: usize,
     fire_rate: f32,
     render: bool,
-    collide: bool,
-    move_enemies: bool,
     warmup_secs: f64,
     measure_secs: f64,
 }
@@ -77,8 +73,6 @@ impl SpikeConfig {
             enemy_count: cli_n.unwrap_or_else(|| env_num("PERF_N", 1000.0) as usize),
             fire_rate: env_num("PERF_FIRE_RATE", 20.0) as f32,
             render: env_flag("PERF_RENDER", true),
-            collide: env_flag("PERF_COLLIDE", true),
-            move_enemies: env_flag("PERF_MOVE", true),
             warmup_secs: env_num("PERF_WARMUP", 4.0),
             measure_secs: env_num("PERF_SECONDS", 12.0),
         }
@@ -183,10 +177,10 @@ fn main() {
             Update,
             (
                 maintain_population,
-                move_enemies.run_if(|c: Res<SpikeConfig>| c.move_enemies),
+                move_enemies,
                 tower_fire,
                 move_projectiles,
-                collide.run_if(|c: Res<SpikeConfig>| c.collide),
+                collide,
             )
                 .chain(),
         )
@@ -441,10 +435,6 @@ fn harness(
     );
     println!("N (enemies)     {}", cfg.enemy_count);
     println!("fire rate       {} shots/s", cfg.fire_rate);
-    println!(
-        "systems         move={} collide={}",
-        cfg.move_enemies, cfg.collide
-    );
     println!("frames measured {frames}");
     println!(
         "frame time      median {median_ms:.3} ms | p95 {p95_ms:.3} ms | p99 {p99_ms:.3} ms"