Q133: remove chaos drills that never injected a fault, and the signals they wrote

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main/database/schema.ts

@@ -94,6 +94,7 @@ import { runActionTargetsSchema } from "./migrations/092-run-action-targets";
 import { taskEnqueueErrorSchema } from "./migrations/093-task-enqueue-error";
 import { dropConfigCountEvalsSchema } from "./migrations/094-drop-config-count-evals";
 import { dropPrBotGatesSchema } from "./migrations/095-drop-pr-bot-gates";
+import { dropChaosDrillsSchema } from "./migrations/096-drop-chaos-drills";
 
 interface Migration {
   version: number;
@@ -197,6 +198,7 @@ const MIGRATIONS: Migration[] = [
   { version: 93, name: "task_enqueue_error", sql: taskEnqueueErrorSchema },
   { version: 94, name: "drop_config_count_evals", sql: dropConfigCountEvalsSchema },
   { version: 95, name: "drop_pr_bot_gates", sql: dropPrBotGatesSchema },
+  { version: 96, name: "drop_chaos_drills", sql: dropChaosDrillsSchema },
 ];
 
 const SCHEMA_VERSION = MIGRATIONS[MIGRATIONS.length - 1].version;