fix: repair other genre thresholds — P5 negative weight

Same weight floor + normalization fix applied to genre-level
other/thresholds.json, matching skill-level and system-apocalypse.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

evolution/genres/other/thresholds.json

@@ -4,11 +4,11 @@
   "rewrite_low": 40,
   "max_revision_rounds": 3,
   "weights": {
-    "P1": 0.24999999999999994,
-    "P2": 0.25,
-    "P3": 0.4,
-    "P4": 0.15,
-    "P5": -0.05000000000000002
+    "P1": 0.2273,
+    "P2": 0.2273,
+    "P3": 0.3636,
+    "P4": 0.1364,
+    "P5": 0.0454
   },
   "stale_hook_limit": 10,
   "burst_hook_limit": 5,