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/web/tracker/domain/src/lib/ports/gateways.ts

@@ -25,6 +25,7 @@ import {
   MemberInput,
   MyIssuesFilter,
   UpdateIssueInput,
+  UpdateProjectInput,
 } from '../models/inputs';
 
 /*
@@ -34,6 +35,8 @@ import {
 
 export abstract class ProjectsGateway {
   abstract myProjects(): Observable<Project[]>;
+  /** Projects anyone can read (no sign-in needed). */
+  abstract publicProjects(): Observable<Project[]>;
   abstract project(idOrKey: string): Observable<Project>;
   abstract stats(projectId: string): Observable<ProjectStats>;
   /** Statistics of the last `days` days. */
@@ -47,6 +50,13 @@ export abstract class ProjectsGateway {
     settings: ProjectSettings,
   ): Observable<CommandResult>;
   abstract create(input: CreateProjectInput): Observable<CommandResult>;
+  /** Name, description or visibility (owners and admins). */
+  abstract update(input: UpdateProjectInput): Observable<CommandResult>;
+  /** Owner only; `confirmKey` must be the project key. */
+  abstract delete(
+    projectId: string,
+    confirmKey: string,
+  ): Observable<CommandResult>;
   abstract addMember(input: MemberInput): Observable<CommandResult>;
   abstract changeMemberRole(input: MemberInput): Observable<CommandResult>;
   abstract removeMember(
@@ -118,11 +128,18 @@ export interface CommentChanged {
   comment: Comment | null;
 }
 
+/** A project changed, or was deleted (then `project` is its last state). */
+export interface ProjectChanged {
+  project: Project;
+  deleted: boolean;
+}
+
+/** Realtime needs a session: without one, these streams stay silent. */
 export abstract class TrackerRealtimeGateway {
   abstract issueChanges(projectId: string): Observable<IssueChanged>;
   abstract commentChanges(issueId: string): Observable<CommentChanged>;
   abstract activity(projectId: string): Observable<Activity>;
   abstract releaseChanges(projectId: string): Observable<Release>;
-  abstract projectChanges(projectId: string): Observable<Project>;
-  abstract myProjectsChanges(): Observable<Project>;
+  abstract projectChanges(projectId: string): Observable<ProjectChanged>;
+  abstract myProjectsChanges(): Observable<ProjectChanged>;
 }