ContractLens — observed JSON sample drift toolkit

ContractLens 0.1.3. Local JSON sample-shape review. Browser app, Node 22+ runner, samples, seven tests and instructions. Empty or truncated arrays yield unobserved fields, not proven removal. Limits: 2 MB, 30 levels, 25,000 nodes, 300 array items. No JSON Schema or API compatibility assurance. Free alternatives include Pact. Original work by Shruti. Rights and delivery guidance: LICENSE.txt. Public preview update pending.