create_segment

Create a new segment with insights criteria.

WORKFLOW:
1. Use search_insights_criteria_fields to discover valid fields
2. Build criteria object
3. Call create_segment with name and criteria

CRITERIA STRUCTURE:
{"operator": "AND|OR", "match": [{field, operator, type, value}, ...]}

FIELD TYPES: MULTIPICKLIST (array of {name,label}), PICKLIST (single {name,label}), STRING, NUMERIC, BOOLEAN, DATE

OPERATORS: AND, OR, EQUALS, NOT_EQUAL, LIKE, NOT_LIKE, IN, NOT_IN, CONTAINS, GREATER_THAN, GREATER_OR_EQUAL, LESS_THAN, LESS_OR_EQUAL, IN_THE_LAST, NOT_IN_THE_LAST, BETWEEN, IN_THE_NEXT, EXISTS, NOT_EXISTS

RETURNS: {id, name, criteria, status, createdDate}
STATUS: READY (usable), PENDING (processing), FAILED (error)

EXAMPLE:
{"name": "High Engagement", "criteria": {"operator": "AND", "match": [{"field": "ENGAGEMENT_SCORE_CLASSIFICATION", "operator": "IN", "type": "MULTIPICKLIST", "value": [{"name": "HIGH", "label": "High"}]}]}}