The Task dataclass has no `summary` field; only Run carries summary.
The dashboard already searches `latest_summary` (derived from the
latest run), so `t.summary` in the client-side haystack was always
undefined and therefore redundant.
Verdict from task t_4bcac44f:
- Before batch QOL (6c7ec94d9): search only covered id, title,
assignee, tenant.
- Batch QOL (7fd187102) correctly added body, result, latest_summary.
- `t.summary` was included but is a misleading no-op because tasks
never expose a `summary` key — `latest_summary` already covers it.
Removes the redundant field from the haystack only.
69053832e3