feat: public projects, project deletion and sagas

Public projects:
- Project.isPublic (create/update, owners and admins). Anyone can read a
  public project without a token: project, board, tickets, comments,
  history, releases, activity, tracking and statistics, over GraphQL and
  REST. Writes stay for members (401 anonymous, 403 outsiders).
- @OptionalAuth() / @ApiOptionalPireonAuth(): anonymous callers allowed,
  invalid tokens still rejected. ReadAccess lets anonymous viewers read
  public projects only; linked tickets are filtered by visibility.
- publicProjects (GraphQL) and GET /api/explore/projects (REST).
- Web: «Explorar» page, project pages open without a session (read-only
  notice, sign-in hints), public badge, visibility switch in settings,
  no realtime subscriptions without a session.

Project deletion:
- Owner only, confirming the key (deleteProject / DELETE
  /api/projects/{project}?confirm=KEY). The key is freed; the read model
  drops the project and members are notified (web goes home).

Sagas (run by the EventsBridge after projections, durable and ordered):
- ProjectDeletionSaga: project deleted → delete its tickets and releases;
  ticket deleted → purge its comments and drop links from other tickets.
- ReleaseArchivedSaga: unfinished tickets leave an archived release.
- UserDeactivatedSaga: the Pireon webhook records UserDeactivatedEvent in
  the event store (EventRecorder); the tracker unassigns that user's open
  tickets as the system actor.
- Internal idempotent commands; domain refusals are logged and skipped,
  concurrency conflicts retried. Affected streams come from the event store
  (TrackerStreamsRepository).

Tests: domain lifecycle specs, saga specs run like the bridge, facade
tests, e2e for public access, cascade deletion, archived releases and
deactivation webhook. Docs, READMEs, schema.gql/openapi.json and Word/PDF
updated.

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

libs/api/tracker/infrastructure/src/lib/mongo/upsert-materialized.repositories.ts

@@ -37,10 +37,22 @@ export class MongoUpsertMaterializedProjectRepository extends UpsertMaterialized
   constructor(
     @InjectModel(ReadModels.Project)
     private readonly projects: Model<ProjectDoc>,
+    @InjectModel(ReadModels.Activity)
+    private readonly activity: Model<ActivityDoc>,
+    @InjectModel(ReadModels.Timeline)
+    private readonly timeline: Model<TimelineDoc>,
   ) {
     super();
   }
 
+  async remove(projectId: string) {
+    await Promise.all([
+      this.projects.deleteOne({ _id: projectId }),
+      this.activity.deleteMany({ projectId }),
+      this.timeline.deleteMany({ projectId }),
+    ]);
+  }
+
   async upsert({
     id,
     version,
@@ -60,10 +72,28 @@ export class MongoUpsertMaterializedProjectRepository extends UpsertMaterialized
 export class MongoUpsertMaterializedIssueRepository extends UpsertMaterializedIssueRepository {
   constructor(
     @InjectModel(ReadModels.Issue) private readonly issues: Model<IssueDoc>,
+    @InjectModel(ReadModels.Timeline)
+    private readonly timeline: Model<TimelineDoc>,
   ) {
     super();
   }
 
+  async remove(issueId: string) {
+    await Promise.all([
+      this.issues.deleteOne({ _id: issueId }),
+      this.issues.updateMany(
+        {
+          $or: [
+            { 'inwardLinks.issueId': issueId },
+            { 'outwardLinks.issueId': issueId },
+          ],
+        },
+        { $pull: { inwardLinks: { issueId }, outwardLinks: { issueId } } },
+      ),
+      this.timeline.deleteMany({ issueId }),
+    ]);
+  }
+
   async upsert({
     id,
     version,
@@ -164,6 +194,10 @@ export class MongoUpsertMaterializedReleaseRepository extends UpsertMaterialized
   }: Pick<ReleaseReadModel, 'id' | 'version'> & Partial<ReleaseReadModel>) {
     await upsertIfNewer(this.releases, id, version, fields);
   }
+
+  async remove(releaseId: string) {
+    await this.releases.deleteOne({ _id: releaseId });
+  }
 }
 
 @Injectable()