[codex] Harden JSON array extraction

[zixuanguo786-ctrl]

Summary

• Add a string/object-aware scanner for top-level JSON array responses.
• Ignore bracketed prose and arrays nested inside JSON objects.
• Keep multiple valid top-level arrays ambiguous instead of guessing.

Test plan

• uv run --with pytest pytest tests/test_json_utils.py -q
• uv run --with ruff ruff check skillopt/utils/json_utils.py tests/test_json_utils.py

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