LLM responses can include bracketed prose before the actual JSON array. The old greedy regex spanned from the first '[' to the last ']', causing valid single-array answers to be dropped and making multiple arrays indistinguishable.
Constraint: Keep object extraction behavior unchanged.
Rejected: Return first parseable array | silently guesses when a response has multiple valid arrays.
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep array extraction conservative when more than one valid top-level array is present.
Tested: uv run --with pytest pytest tests/test_json_utils.py -q
Tested: uv run --with ruff ruff check skillopt/utils/json_utils.py tests/test_json_utils.py
Not-tested: Full benchmark rollouts.
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