[schani]

Summary

• add a recursive Vitest fixture runner for <name>.schema.json, <name>.pass.<case-id>.json, and <name>.fail.<case-id>.json
• validate malformed names, orphaned cases, empty schema groups, and invalid JSON with path-specific errors
• document the convention and add npm run test:fixtures
• migrate all 239 existing validation-only tests into 229 schema files and 661 pass/fail inputs
• retain TypeScript tests that inspect Zod structure or parsed output, exercise internal helpers, use non-JSON values, or construct recursive inputs programmatically

Why

Most validation regressions only need a JSON Schema plus accepted and rejected JSON values. Keeping those cases as data removes repetitive test code and makes new coverage possible by adding files alone.

Validation

• vitest run tests/json-fixtures.test.ts — 661 passed
• vitest run --coverage --exclude '.claude/**' — 1,962 passed, 104 skipped; 100% statements, lines, and functions
• npm run build — passed