2026-05-07 Event: Service Meter Reading Added

New event_attachments array added carrying file metadata (entity_id, filename, mime_type, size_bytes, s3ref, version_index, readable_size, _tags, relation_tags, category, file_date, _created_at) for every file related to the ticket — consumers should filter by relation_tags, _tags, mime_type, or _created_at proximity to reading_timestamp to identify the meter reading photo
New ticket_files array added on the hydrated entity graph carrying the full file entity objects