feat: add agent API and operational analytics

tests/repositories.test.ts

@@ -6,6 +6,8 @@ import {
   MessagesRepository,
   SuccessfulMessagesRepository,
   ConversationStateRepository,
+  ConversationOutcomesRepository,
+  RecipientHistoryRepository,
 } from '../src/database/repositories.js';
 import { buildConversationState } from '../src/services/conversation-state.js';
 
@@ -607,6 +609,37 @@ describe('ConversationStateRepository', () => {
   });
 });
 
+describe('Mature performance and guardrails', () => {
+  it('excludes pending sends and reports a confidence interval', () => {
+    const { postsRepo, messagesRepo } = createTestRepositories();
+    postsRepo.insert({ id: 'old', subreddit: 'test', author: 'old-user', title: 'old', imageUrl: null, processedAt: 1 });
+    postsRepo.insert({ id: 'new', subreddit: 'test', author: 'new-user', title: 'new', imageUrl: null, processedAt: 1 });
+    const oldId = messagesRepo.insert({
+      postId: 'old', recipient: 'old-user', subject: 's', message: 'm',
+      sentAt: Date.now() - 72 * 3600000, strategyId: 'direct',
+    });
+    messagesRepo.markGotResponse(oldId);
+    messagesRepo.insert({
+      postId: 'new', recipient: 'new-user', subject: 's', message: 'm',
+      sentAt: Date.now(), strategyId: 'direct',
+    });
+
+    expect(messagesRepo.getStrategyStats(Date.now() - 48 * 3600000)).toEqual([
+      expect.objectContaining({
+        strategyId: 'direct', totalSent: 1, totalResponses: 1, responseRate: 100,
+        pendingSent: 1, responseRateLow: expect.any(Number), responseRateHigh: expect.any(Number),
+      }),
+    ]);
+  });
+
+  it('suppresses boundary recipients across account history checks', () => {
+    const db = createTestDb();
+    const outcomes = new ConversationOutcomesRepository(db);
+    outcomes.suppressRecipient('Alice', 'boundary');
+    expect(new RecipientHistoryRepository(db).hasSentTo('alice')).toBe(true);
+  });
+});
+
 describe('Repository edge cases', () => {
   it('handles special characters in post titles', () => {
     const repos = createTestRepositories();