feat: ask a teammate to review a ticket

«Pedir revisión» on a ticket asks a member (with an optional note): they
are notified and see it under «Te piden revisión» in my work until they
answer «Todo bien» or «Pedir cambios» (with what to change) from the
ticket's Revisiones box; whoever asked hears the answer and can withdraw
an open request. Events of the ticket (requested, answered, cancelled),
so they show in its history and the activity feed. Viewers can be asked
and answer; not oneself, nor twice the same person with one pending.

API: requestReview / answerReview / cancelReview, Issue.reviews,
myIssues(reviewing); POST /api/issues/{issue}/reviews,
POST …/reviews/{id}/answer, DELETE …/reviews/{id}. MCP: request_review,
answer_review, my_issues reviewing.

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

libs/api/tracker/domain/src/lib/events/index.ts

@@ -17,6 +17,7 @@ export * from './comment-edited.event';
 export * from './comment-reacted.event';
 export * from './comment-decision-marked.event';
 export * from './comment-thread-resolved.event';
+export * from './issue-review.events';
 export * from './comment-deleted.event';
 export * from './release-created.event';
 export * from './release-updated.event';

libs/api/tracker/domain/src/lib/events/issue-review.events.ts

@@ -0,0 +1,46 @@
+import { AutowiredEvent } from '@task-stream/api/shared/domain';
+import { ReviewVerdict } from '../issue/review';
+import { TrackerEvent } from './tracker.event';
+
+/** Someone asked someone else to review a ticket. */
+@AutowiredEvent
+export class IssueReviewRequestedEvent extends TrackerEvent {
+  constructor(
+    actorId: string,
+    issueId: string,
+    projectId: string,
+    readonly reviewId: string,
+    readonly reviewerId: string,
+    readonly note: string | null,
+  ) {
+    super(actorId, issueId, projectId);
+  }
+}
+
+/** The reviewer answered: all good, or changes wanted. */
+@AutowiredEvent
+export class IssueReviewAnsweredEvent extends TrackerEvent {
+  constructor(
+    actorId: string,
+    issueId: string,
+    projectId: string,
+    readonly reviewId: string,
+    readonly verdict: ReviewVerdict,
+    readonly answer: string | null,
+  ) {
+    super(actorId, issueId, projectId);
+  }
+}
+
+/** A review request was withdrawn before it was answered. */
+@AutowiredEvent
+export class IssueReviewCancelledEvent extends TrackerEvent {
+  constructor(
+    actorId: string,
+    issueId: string,
+    projectId: string,
+    readonly reviewId: string,
+  ) {
+    super(actorId, issueId, projectId);
+  }
+}