Add SpecShield

[specshield26]

SpecShield is a contract compatibility testing tool for OpenAPI. It compares two OpenAPI descriptions to detect breaking changes, verifies a provider description against consumer contracts, and gates deployments in CI via can-i-deploy.

Against the contribution guidelines:

• Real-world use — ~7,400 npm downloads over the last 12 months, ~1,900 in the last 30: https://www.npmjs.com/package/specshield
• Testable — published on npm and usable with no account: npx specshield compare old.yaml new.yaml. There is also a free, no-login comparison at https://specshield.io/diff if you would rather not install anything to review this.
• Relevant — OpenAPI-native, MIT licensed.
• Terminology — I have used "OpenAPI description" throughout per the glossary; please correct me if I have slipped anywhere.

Categories: misc and schema-validators — matching where the other change-detection tools sit (oasdiff, openapi-diff, api-smart-diff) and vacuum's use of schema-validators for linting. Happy to move it if you would place it differently. One note: bdct verify-provider does execute requests against a live provider and validate the responses against the description, so testing may also apply — your call.

Version support — v2: true is included because the parser accepts Swagger 2.0 documents; I verified a 2.0-to-2.0 comparison end to end before claiming it. v3_2 is left false as I have no 3.2-specific handling to point to.

[netlify]

👷 Deploy request for openapi-dot-tools pending review.

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