fix: keep records raw output valid JSON

[JordanCoin]

Closes #72

Summary

• keep progress output out of records search --raw
• emit a strict JSON document through Typer
• cover control-character escaping and JSON round-trip with the real CLI path

Verification

• python -m pytest tests/test_records_cli.py -v
• ruff check openfoia/cli.py tests/test_records_cli.py
• ruff format --check openfoia/cli.py tests/test_records_cli.py
• independent review: pass

The full suite reached 279 passed and 26 skipped; two pre-existing LLM extraction tests require an unavailable local LLM and failed unchanged.

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