Review Regression Challenges Contract

Canonical contract for review_regression_challenges rows.

Required Fields

• prompt (string)
• response (string)
• category (string)
• severity (string)
• placement_kind (string)
• source_id (string)
• repository_id (string)
• pr_number (integer)
• correctness_state (string)
• sample_kind (string): must be review_regression_challenges

Optional Fields

• file_path (string|null)
• line_start (integer|null)

Integrity Rules

• Regression challenge rows should come from warning/error findings.
• Empty prompt or response rows are invalid and must be rejected.