Creates a new position (job requisition) for the company and returns the newly created position object.

name, type, description, and location.country are required. type, experience, and education must match Breezy's supported values, and location.state is validated against US states or Canadian provinces when location.country is US or CA. If provided, department and category are checked against the company's configured departments/categories (custom categories are allowed in addition to the built-in list), and pipeline_id, scorecard_id, and questionnaire_id must reference existing company resources — an unrecognized id returns a 404. salary.currency must be a supported currency code, and salary.period is matched case-insensitively against Breezy's standard salary periods or the company's own custom salary terms. Fields outside the documented schema are dropped before the position is saved.