feat(ai,mcp): идентичность прогона реиндекса + брендированные PageId/SlugId (#495 item 14)

Аспект A — идентичность прогона реиндекса эмбеддингов.
У статуса/поллинга реиндекса не было идентичности КОНКРЕТНОГО прогона, из-за
чего класс багов «это тот же прогон или новый?» чинили дважды. Теперь каждый
прогон получает свой runId (crypto.randomUUID в start()), он хранится в Redis-
хэше рядом с total/done/startedAt и возвращается в ReindexProgress. Эндпоинт
статуса (getMasked -> MaskedAiSettings) отдаёт runId и reindexStartedAt. Клиент
кеит поллинг на (runId, startedAt): смена runId = НОВЫЙ прогон (сбрасываем
залатанное per-run состояние поллинга), тот же runId = тот же прогон. Всё
best-effort/косметика как и остальной код прогресса: пустой/отсутствующий runId
деградирует мягко и никогда не ломает реиндекс.

Аспект B — брендированные PageId/SlugId в MCP-клиенте + валидация формата в
серверных DTO (семейство инцидентов #435: двойная идентичность страницы —
внутренний id и slugId — гонялась как голая строка и молча путалась).
- packages/mcp/src/lib/page-id.ts: номинальные типы PageId/SlugId + валидирующие
  конструкторы asPageId/asSlugId и гварды isPageId/isSlugId (формат UUID и
  10-символьного slugId). PageId протянут через единственный узел канонизации и
  записи: resolvePageId() теперь возвращает PageId, а ключ per-page лока
  (withPageLock) и точки записи в collab (mutatePageContent/replacePageContent/
  updatePageContentRealtime) требуют бренд — сырой slugId/непроверенный id больше
  не проходит проверку типов (инвариант #260 «resolve-then-lock» теперь на уровне
  компилятора). Публичный вход методов остаётся строкой (это legitimно UUID ИЛИ
  slugId), брендируется каноническое значение.
- apps/server core/page/dto: PageIdDto.pageId получает валидацию формата
  (@Matches, UUID или 10-символьный slugId), так что кривая/подменённая
  идентичность отклоняется на границе, а не падает в repo голой строкой.

Тесты (все зелёные, с mutation-verify каждого):
- server: getMasked отдаёт runId/reindexStartedAt; стор пишет/читает runId и
  мягко деградирует его до ''; DTO отклоняет кривой pageId/slugId и принимает
  валидный.
- client: чистый хелпер reindexRunKey/isNewReindexRun (кеинг поллинга на runId).
- mcp: конструкторы/гварды PageId/SlugId (валидация формата).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/server/src/integrations/ai/ai-settings.service.spec.ts

@@ -99,10 +99,12 @@ describe('AiSettingsService.getMasked reindex progress', () => {
     // actually pins the progress.total branch rather than coincidentally
     // matching the DB fallback. With fix #1 the two sources agree in practice,
     // but getMasked must still return progress.total when a record is active.
+    const startedAt = Date.now();
     reindexProgress.get.mockResolvedValue({
       total: 500,
       done: 120,
-      startedAt: Date.now(),
+      startedAt,
+      runId: 'run-abc',
     });
 
     const masked = await service.getMasked(WORKSPACE_ID);
@@ -110,6 +112,10 @@ describe('AiSettingsService.getMasked reindex progress', () => {
     expect(masked.indexedPages).toBe(120); // progress.done, not DB 478
     expect(masked.totalPages).toBe(500); // progress.total, not DB 478
     expect(masked.reindexing).toBe(true);
+    // The status payload must carry the run identity so the client can key its
+    // poll on it (a changed runId => a NEW run).
+    expect(masked.runId).toBe('run-abc');
+    expect(masked.reindexStartedAt).toBe(startedAt);
   });
 
   it('falls back to countIndexedPages when no reindex is active', async () => {
@@ -121,6 +127,10 @@ describe('AiSettingsService.getMasked reindex progress', () => {
     expect(masked.indexedPages).toBe(478);
     expect(masked.totalPages).toBe(478);
     expect(masked.reindexing).toBe(false);
+    // No active run -> no run identity surfaced (the client keeps its prior
+    // steady-state behaviour).
+    expect(masked.runId).toBeUndefined();
+    expect(masked.reindexStartedAt).toBeUndefined();
   });
 });
 

apps/server/src/integrations/ai/ai-settings.service.ts

@@ -371,6 +371,12 @@ export class AiSettingsService {
       totalPages,
       // Optional hint for the client: a reindex run is currently in progress.
       reindexing: progress != null,
+      // Per-run identity so the client can key its poll on a stable run id and
+      // reset its per-run state when a NEW run starts. Present only while a run
+      // is active; `runId` may be '' for a legacy/degraded record (the client
+      // treats that as "no identity").
+      runId: progress?.runId,
+      reindexStartedAt: progress?.startedAt,
     };
   }
 

apps/server/src/integrations/ai/ai.types.ts

@@ -149,4 +149,14 @@ export interface MaskedAiSettings {
   // True while a full workspace reindex is actively running (the counts above
   // then reflect the live run progress rather than the steady-state DB count).
   reindexing?: boolean;
+  // Identity of the ACTIVE reindex run (present only while `reindexing`). The
+  // client keys its poll on `runId`: a changed value means a NEW run (reset the
+  // per-run poll state it latched), the same value means the run it is already
+  // watching — removing the "same run or a fresh one?" ambiguity a stale
+  // pre-reindex snapshot otherwise causes. Absent/empty degrades gracefully.
+  runId?: string;
+  // Epoch-ms the active run started (present only while `reindexing`). Paired
+  // with `runId` so a run that restarts with the same (recycled) id is still
+  // seen as new.
+  reindexStartedAt?: number;
 }

apps/server/src/integrations/ai/embedding-reindex-progress.service.spec.ts

@@ -48,19 +48,38 @@ describe('EmbeddingReindexProgressService', () => {
   }
 
   describe('get', () => {
-    it('maps a valid hash to a ReindexProgress object', async () => {
+    it('maps a valid hash to a ReindexProgress object (incl. the run identity)', async () => {
       const { redis, hgetall } = makeRedis();
-      hgetall.mockResolvedValue({ total: '478', done: '120', startedAt: '1000' });
+      hgetall.mockResolvedValue({
+        total: '478',
+        done: '120',
+        startedAt: '1000',
+        runId: 'run-xyz',
+      });
       const service = makeService(redis);
 
       await expect(service.get(WORKSPACE_ID)).resolves.toEqual({
         total: 478,
         done: 120,
         startedAt: 1000,
+        runId: 'run-xyz',
       });
       expect(hgetall).toHaveBeenCalledWith(KEY);
     });
 
+    it('degrades a missing runId to an empty string (legacy/partial record)', async () => {
+      const { redis, hgetall } = makeRedis();
+      // A record written before runId existed: get() must still succeed and
+      // report runId='' so the client treats it as "no identity", never breaks.
+      hgetall.mockResolvedValue({ total: '10', done: '3', startedAt: '5' });
+      await expect(makeService(redis).get(WORKSPACE_ID)).resolves.toEqual({
+        total: 10,
+        done: 3,
+        startedAt: 5,
+        runId: '',
+      });
+    });
+
     it('returns null for an empty hash (no record)', async () => {
       const { redis, hgetall } = makeRedis();
       hgetall.mockResolvedValue({});
@@ -87,11 +106,17 @@ describe('EmbeddingReindexProgressService', () => {
 
     it('coerces a non-finite startedAt to 0', async () => {
       const { redis, hgetall } = makeRedis();
-      hgetall.mockResolvedValue({ total: '10', done: '2', startedAt: 'nope' });
+      hgetall.mockResolvedValue({
+        total: '10',
+        done: '2',
+        startedAt: 'nope',
+        runId: 'run-1',
+      });
       await expect(makeService(redis).get(WORKSPACE_ID)).resolves.toEqual({
         total: 10,
         done: 2,
         startedAt: 0,
+        runId: 'run-1',
       });
     });
 
@@ -115,6 +140,21 @@ describe('EmbeddingReindexProgressService', () => {
       expect(multiObj.exec).toHaveBeenCalledTimes(1);
     });
 
+    it('mints a fresh non-empty runId into the record on each start', async () => {
+      const { redis, multiObj } = makeRedis();
+      const service = makeService(redis);
+      await service.start(WORKSPACE_ID, 1);
+      await service.start(WORKSPACE_ID, 1);
+
+      const firstRunId = multiObj.hset.mock.calls[0][1].runId;
+      const secondRunId = multiObj.hset.mock.calls[1][1].runId;
+      expect(typeof firstRunId).toBe('string');
+      expect(firstRunId).not.toBe('');
+      // Each run gets its OWN identity so the client can tell a re-trigger apart
+      // from the run it is already watching.
+      expect(secondRunId).not.toBe(firstRunId);
+    });
+
     it('defaults the expire TTL to the full 1h record TTL', async () => {
       const { redis, multiObj } = makeRedis();
       await makeService(redis).start(WORKSPACE_ID, 478);

apps/server/src/integrations/ai/embedding-reindex-progress.service.ts

@@ -1,17 +1,28 @@
 import { Injectable, Logger } from '@nestjs/common';
 import { RedisService } from '@nestjs-labs/nestjs-ioredis';
+import { randomUUID } from 'node:crypto';
 import type { Redis } from 'ioredis';
 
 /**
  * Live progress of an in-flight workspace embeddings reindex run.
  * `total` is the number of pages the run will process, `done` how many it has
  * already processed (success OR handled failure), `startedAt` the epoch-ms the
- * record was created.
+ * record was created, and `runId` a per-run identity minted at `start()`.
+ *
+ * `runId` gives each reindex run a stable identity so a poller can tell "same
+ * run I've been watching" from "a NEW run started" WITHOUT guessing from the
+ * progress counters (the ambiguity that a stale pre-reindex snapshot vs a fresh
+ * run otherwise causes — the bug class fixed twice under #262). It is best-
+ * effort like the rest of this record: a record written before this field
+ * existed (or a Redis hiccup) yields an empty `runId`, which the client must
+ * treat as "no identity available" and degrade to its prior behaviour, never
+ * break.
  */
 export interface ReindexProgress {
   total: number;
   done: number;
   startedAt: number;
+  runId: string;
 }
 
 /** Redis key namespace for the per-workspace reindex-progress record. */
@@ -86,12 +97,18 @@ export class EmbeddingReindexProgressService {
   ): Promise<void> {
     const key = this.key(workspaceId);
     try {
+      // A fresh identity per run so the client poll can key on it: a changed
+      // runId means a genuinely NEW run (reset any latched per-run poll state),
+      // the same runId means the run the client is already watching. Best-effort
+      // like the counters — never surfaced to the user, only used to disambiguate.
+      const runId = randomUUID();
       await this.redis
         .multi()
         .hset(key, {
           total: String(total),
           done: '0',
           startedAt: String(Date.now()),
+          runId,
         })
         .expire(key, ttlSeconds)
         .exec();
@@ -150,7 +167,15 @@ export class EmbeddingReindexProgressService {
       const done = Number(data.done);
       const startedAt = Number(data.startedAt);
       if (!Number.isFinite(total) || !Number.isFinite(done)) return null;
-      return { total, done, startedAt: Number.isFinite(startedAt) ? startedAt : 0 };
+      // `runId` degrades gracefully: a pre-existing record (written before this
+      // field) or a stripped value reads as '' — the client treats that as "no
+      // identity" and keeps its prior behaviour rather than breaking the poll.
+      return {
+        total,
+        done,
+        startedAt: Number.isFinite(startedAt) ? startedAt : 0,
+        runId: typeof data.runId === 'string' ? data.runId : '',
+      };
     } catch (err) {
       this.logger.warn(
         `reindex-progress read failed for workspace ${workspaceId}; ` +