Validate Block JSON

Ensure every curriculum/structure/blocks/*.json file matches the CI-validated schema and constraints.

• Remove deprecated/unused fields (e.g., name)—CI may reject these.
• Ensure required identifiers conform to CI rules (e.g., block/challenge id must be valid and not too short).
• If CI fails, fix the JSON payload in the same branch (don’t rely on retries).

Example (schema-compliant style):

{
  "isUpcomingChange": false,
  "dashedName": "workshop-envelope-budget-app",
  "helpCategory": "HTML-CSS",
  "blockLayout": "challenge-grid",
  "blockLabel": "workshop",
  "challengeOrder": [
    { "id": "<valid-id-length-and-format>", "title": "Step 1" }
  ]
}