feat: release notes

Each release can carry notes in Markdown, written before or after it
ships. A draft is generated from its finished tickets grouped by type, to
edit and copy from the releases page.

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

libs/web/tracker/application/src/lib/events/project.events.ts

@@ -27,6 +27,10 @@ export const projectPageEvents = eventGroup({
     releaseCreateRequested: type<CreateReleaseInput>(),
     releasePublishRequested: type<{ releaseId: string; force: boolean }>(),
     releaseArchiveRequested: type<{ releaseId: string }>(),
+    releaseNotesWriteRequested: type<{
+      releaseId: string;
+      notes: string | null;
+    }>(),
     sprintCreateRequested: type<CreateSprintInput>(),
     sprintUpdateRequested: type<UpdateSprintInput>(),
     sprintStartRequested: type<{ sprintId: string }>(),