Add duplicate-key validation for model config JSONs

[akhilmmenon]

Summary

• add a new validation script at scripts/check_duplicate_keys.py to catch:
  • duplicate JSON object keys at any nesting level (e.g. duplicate model IDs like "gpt-4")
  • duplicate params[].key values within the same params array (e.g. two "max_tokens" entries)
• update .github/workflows/validate-json.yml to run on both push and pull_request to main for pricing/** and general/**
• add a new workflow step to run python3 scripts/check_duplicate_keys.py after existing jq syntax checks

Why

jq empty only validates JSON syntax and does not fail when duplicate object keys exist.
This change prevents silent config overrides and conflicting param definitions from being merged.

Test plan

• run locally from models/:
  • python3 scripts/check_duplicate_keys.py
• verify workflow behavior:
  • passes when no duplicate keys are present
  • fails with GitHub Actions ::error annotations when duplicates are found

Notes

• current repo data already contains some duplicate params[].key entries (e.g. response_format in certain gpt-5* sections), so CI may fail until those are cleaned up.

[Copilot]

Pull request overview

Adds CI validation to prevent silent overrides in general/*.json and pricing/*.json by detecting duplicate JSON object keys and duplicate params[].key entries, complementing existing jq syntax checks.

Changes:

• Added scripts/check_duplicate_keys.py to detect duplicate JSON object keys and duplicate params[].key values.
• Updated validate-json.yml to run on push to main (path-filtered) in addition to pull_request.
• Added a workflow step to execute the duplicate-key validation script after jq validation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
scripts/check_duplicate_keys.py	New Python validator to detect duplicate JSON object keys and duplicate params[].key entries.
.github/workflows/validate-json.yml	Adds push trigger and runs the new duplicate-key validator in CI.

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