feat: dashboard forecasts releases, tells what changed and weighs the load

The insights reading grows (GraphQL insights(since:), REST ?since=, MCP):
- planned releases with a likely (p50) and safe (p85) finish date from a
  Monte Carlo over the last six weeks of finished work, one after another,
  and a verdict against their target;
- with `since` (the viewer's last visit, kept in the browser): tickets
  created, finished and sent back from QA, and their mentions;
- each person's open points against what they closed per sprint lately;
- open tickets without estimate, area or assignee, or untouched for 90
  days, each count opening the list filtered (new noEstimate, noArea and
  updatedBefore filters).

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

libs/api/tracker/infrastructure/src/lib/mongo/find.repositories.ts

@@ -450,6 +450,9 @@ function toMongoFilter(filter: IssueFilter): FilterQuery<IssueDoc> {
       ...(filter.dueTo ? { $lte: `${filter.dueTo}\uffff` } : {}),
     };
   // Only field ids: a key never becomes an operator.
+  if (filter.noEstimate) query['storyPoints'] = null;
+  if (filter.noArea) query['area'] = null;
+  if (filter.updatedBefore) query['updatedAt'] = { $lt: filter.updatedBefore };
   for (const [field, value] of Object.entries(filter.customFields ?? {}))
     if (/^[A-Z][A-Z0-9_]{0,29}$/.test(field) && typeof value === 'string')
       query[`customFields.${field}`] = value;