feat: archive a project instead of deleting it

The owner archives a finished project (archiveProject, POST
/projects/{project}/archive) and brings it back (unarchive). While
archived it stays readable, managers still read its rules and webhooks,
but no command changes it: contributing and managing checks refuse with
422, votes and public proposals too, and automations do not run. The web
shows a read-only notice on every page of it (with «Desarchivar» for the
owner), hides what edits, marks it on the home page and lists it last.

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

libs/api/tracker/application/src/lib/event-handlers/activity-summary.ts

@@ -26,6 +26,8 @@ import {
   ProjectRole,
   ProjectSettingsChangedEvent,
   ProjectUpdatedEvent,
+  ProjectArchivedEvent,
+  ProjectUnarchivedEvent,
   ProjectWorkflow,
   ReleaseArchivedEvent,
   ReleaseNotesWrittenEvent,
@@ -109,6 +111,10 @@ export function describeEvent(
     return `${actor} creó el proyecto ${event.project.key}`;
   if (event instanceof ProjectUpdatedEvent)
     return `${actor} actualizó el proyecto ${ctx.projectKey}`;
+  if (event instanceof ProjectArchivedEvent)
+    return `${actor} archivó el proyecto ${ctx.projectKey}`;
+  if (event instanceof ProjectUnarchivedEvent)
+    return `${actor} desarchivó el proyecto ${ctx.projectKey}`;
   if (event instanceof ProjectSettingsChangedEvent)
     return `${actor} cambió los estados, tipos o áreas del proyecto ${ctx.projectKey}`;
   if (event instanceof ProjectMemberAddedEvent) {