fix(judge): retry unusable json mode responses

[adity982]

Summary

• let the OpenAI-compatible completion helper validate extracted JSON for its caller
• when JSON mode returns an unusable judge payload such as {}, retry exactly once without response_format
• keep the second response as the terminal result and add regression coverage proving the fallback request omits JSON mode

Validation

• full core suite: 167 tests, 164 passed, 3 expected skips
• repository pre-commit hook: typecheck, lint, repo-wide Prettier, catalog generation, skill validation, and gitleaks

Closes #165

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[jithin23-kv]

Hi @adity982, appreciate you contributing to Agent Opfor.
I noticed this PR is still marked as a draft. Are you still working on more changes, or is it ready to be marked as ready for review?