feat(FN-3391): persist evaluator evidence with score categories

- Add eval score category types and exports in core with store support and coverage
- Implement engine evaluator evidence extraction and persistence with dedicated tests
- Update evaluator flow and cron wiring to record evidence alongside eval runs
- Refresh architecture, storage, and eval docs for evidence and categorization behavior

Fusion-Task-Id: FN-3391

packages/engine/src/cron-runner.ts

@@ -488,7 +488,7 @@ export class CronRunner {
   ): Promise<AutomationRunResult> {
     const settings = await this.store.getSettings();
     const evalSettings = resolveTaskEvaluationSettings(settings);
-    const evaluator = new HybridEvaluatorService({ cwd: this.options.workingDirectory ?? process.cwd() });
+    const evaluator = new HybridEvaluatorService({ cwd: this.options.workingDirectory ?? process.cwd(), store: this.store });
 
     const result = await runScheduledEvalBatch({
       store: this.store,