feat: alerts open bugs, and repeats of the same problem go to that bug

Owners and admins turn on a secret URL per project (Settings →
Integrations), POST /api/webhooks/alerts/{project}/{token}, that Sentry,
Uptime Kuma, Prometheus Alertmanager, Grafana or any tool sending JSON
with a title can call. A new problem opens a bug as TaskStream (label
«alerta», chosen type and priority); while that bug is open, the same
fingerprint goes to it (a comment at most every 30 minutes) and
«resolved» is said on it; once it is closed, a new bug names the old
one. Alerts of a project are handled one at a time, so two at once open
one bug, and a bug not yet projected still counts as open. Unknown
project, alerts off or a bad token all answer 403.

TaskStream may now comment as the system actor, like it already opened
tickets for public proposals. Stored in Mongo (alert_integrations,
alert_traces), not in the event store.

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

libs/api/tracker/application/src/lib/commands/add-comment.command-handler.ts

@@ -1,6 +1,9 @@
 import { CommandHandler, EventPublisher, ICommandHandler } from '@nestjs/cqrs';
 import { BusinessRuleError } from '@task-stream/api/shared/domain';
-import { CommentFactory } from '@task-stream/api/tracker/domain';
+import {
+  CommentFactory,
+  SYSTEM_ACTOR_ID,
+} from '@task-stream/api/tracker/domain';
 import { AddCommentCommand } from './add-comment.command';
 import { CommandResult, ack } from './command-result';
 import { WriteAccess } from './write-access';
@@ -16,10 +19,17 @@ export class AddCommentCommandHandler
   ) {}
 
   async execute(command: AddCommentCommand): Promise<CommandResult> {
-    const { issue } = await this.access.issueForReporter(
-      command.issueId,
-      command.actorId,
-    );
+    // TaskStream itself (alerts that repeat) is no member; only internal
+    // commands act as it, never a request from outside.
+    const issue =
+      command.actorId === SYSTEM_ACTOR_ID
+        ? await this.access.issue(command.issueId)
+        : (await this.access.issueForReporter(command.issueId, command.actorId))
+            .issue;
+    if (issue.trashedAt)
+      throw new BusinessRuleError(
+        `${issue.key} is in the trash: restore it to change it`,
+      );
     const comment = this.commentFactory.create({
       issueId: issue.id,
       projectId: issue.projectId,