feat: predator proximity danger signal + prominent generation display

- Predator proximity injected into danger sensory neurons so prey
  can evolve neural escape behavior (distance < 5 → danger signal)
- Generation count displayed prominently in HUD (large cyan text)
- Species count (Ce/Dm) verified rendering in HUD

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: masonwyatt23

creatures-core/creatures/environment/brain_world.py

@@ -527,6 +527,15 @@ def _inject_sensory_input(self, alive: np.ndarray) -> None:
                         danger_signal[org_i] + toxin_current, 50.0
                     ) * float(alive_org[org_i])
 
+        # Add predator proximity danger: when a predator is within 5.0 units,
+        # inject signal proportional to closeness. This gives prey neural input
+        # about nearby predators — evolution can wire this to escape behavior.
+        if hasattr(eco, 'predator_proximity'):
+            pred_prox = eco.predator_proximity[:n_org]
+            nearby = pred_prox < 5.0
+            pred_danger = np.where(nearby, (5.0 - pred_prox) / 5.0, 0.0) * 30.0 * alive_org
+            danger_signal = np.minimum(danger_signal + pred_danger, 50.0)
+
         danger_start, danger_end = self.sensory_channels["danger"]
         danger_offsets = np.arange(danger_start, danger_end)
         global_danger = (org_idx[:, None] * self.n_per + danger_offsets[None, :]).ravel()

creatures-web/src/components/world/UnifiedWorld.tsx

@@ -354,16 +354,21 @@ function HudOverlay() {
                 color: 'rgba(140,170,200,0.4)',
                 textTransform: 'uppercase',
                 letterSpacing: 1,
-                marginBottom: 4,
+                marginBottom: 2,
               }}
             >
-              Evolution
+              Gen
             </div>
-            <div>
-              Generation:{' '}
-              <span style={{ color: '#ffcc88' }}>
-                {populationStats.max_generation}
-              </span>
+            <div
+              style={{
+                fontSize: 16,
+                fontWeight: 700,
+                color: '#00d4ff',
+                lineHeight: 1.1,
+                marginBottom: 6,
+              }}
+            >
+              {populationStats.max_generation}
             </div>
             <div>
               Lineages:{' '}