feat: add live replays and PostgreSQL maintenance tools

- Stream compact live replay updates across local and clustered dashboards.
- Render responsive snake bodies as SVG paths with aligned custom icons.
- Add cache-busted assets, replay fallback routes, and live-follow playback.
- Support PostgreSQL benchmark sampling and idempotent SQLite migration.
- Add dry-run cleanup for old low-quality PostgreSQL replay payloads.
- Reward safe perimeter lanes and bump Prism to version 1.5.0.
- Add backend, migration, dashboard, and perimeter regression coverage.

snakes/strategies/apex.py

@@ -8,6 +8,7 @@ from quart_common.web.env import env_int
 
 from server.dataset.RLBootstrapDataset import RLBootstrapDataset
 from snakes.core.template import TemplateSnake
+from snakes.engine.perimeter import perimeter_geometry_score
 from server.GameBoard import GameBoard
 
 class ApexBattleSnake(TemplateSnake):
@@ -686,19 +687,22 @@ class ApexBattleSnake(TemplateSnake):
         or (next_opts == 0 and not has_tail_escape)
       )
 
-    cx, cy = (width - 1) / 2.0, (height - 1) / 2.0
-    center_score = 1.0 - (abs(point[0] - cx) + abs(point[1] - cy)) / max(1.0, cx + cy)
-
-    min_wall_dist = min(point[0], width - 1 - point[0], point[1], height - 1 - point[1])
-    if total_occupancy > 0.25:
-      if min_wall_dist == 0:
-        edge_penalty = 35.0 * total_occupancy
-      elif min_wall_dist == 1:
-        edge_penalty = 15.0 * total_occupancy
-      else:
-        edge_penalty = 0.0
-    else:
-      edge_penalty = 0.0
+    geometry_score = perimeter_geometry_score(
+      point=point,
+      current_head=(my_body[0]["x"], my_body[0]["y"]),
+      width=width,
+      height=height,
+      occupancy=total_occupancy,
+      snake_length=len(future_body),
+      reachable_space=reachable_space,
+      required_space=required_space,
+      liberties=liberties,
+      next_options=next_opts,
+      safe_next_options=en_safe_opts,
+      tail_escape=has_tail_escape,
+      dead_end=dead_end,
+      losing_head_to_head=losing_h2h,
+    )
 
     hunger = max(0.0, (60.0 - my_health) / 60.0)
 
@@ -719,7 +723,7 @@ class ApexBattleSnake(TemplateSnake):
     score += liberties * 20.0
     score += next_opts * 10.0
     score += en_safe_opts * 24.0
-    score += center_score * 14.0
+    score += geometry_score
 
     if en_safe_opts == 0:
       score -= 1700.0
@@ -727,7 +731,6 @@ class ApexBattleSnake(TemplateSnake):
       score -= 420.0
 
     score -= art_penalty
-    score -= edge_penalty
     score -= h2h_dist2_penalty
 
     if dead_end:
@@ -1421,7 +1424,7 @@ class ApexBattleSnake(TemplateSnake):
           can_grow = self._enemy_can_grow_this_turn(snake, food_set)
         if not can_grow:
           enemy_vacating_tails.add((snake["body"][-1]["x"], snake["body"][-1]["y"]))
-    safe: MoveMap = {}
+    safe: ApexBattleSnake.MoveMap = {}
     for move, (dx, dy) in self.DIRECTIONS.items():
       pt = (my_head["x"] + dx, my_head["y"] + dy)
       if not self._in_bounds(pt, width, height):