Add CI check to validate JSON files in schema/ on pull requests

[Copilot]

No automated validation existed for JSON files added to the schema/ directory, making it easy to merge malformed files silently.

Changes

.github/workflows/validate-json.yml

• Triggers on PRs touching schema/**
• Runs the validation script and fails the check on any malformed file
• Scoped to permissions: contents: read

.github/scripts/validate_json.py

• Recursively validates all *.json files under a given directory (default: schema/)
• Uses Python's built-in json.load() with proper resource handling
• Emits per-file VALID/INVALID output with exact parse error location; exits non-zero on any failure

VALID: schema/event_schema.json
VALID: schema/event_transaction.json
INVALID: schema/broken.json — Expecting value: line 3 column 5 (char 42)

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[Copilot]

Pull request overview

Adds a pull-request CI gate to ensure JSON files under schema/ are syntactically valid, preventing malformed JSON from being merged unnoticed.

Changes:

• Introduces a GitHub Actions workflow that runs on PRs affecting schema/**.
• Adds a Python script that recursively parses *.json files and fails CI on any decode errors.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
.github/workflows/validate-json.yml	New PR workflow to run JSON validation when schema/** changes.
.github/scripts/validate_json.py	New validator script that walks schema/ and checks JSON parseability.

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