refactor: trim jsonl_parser all to public API only (#88) #179

Job	Run time
mypy	22s
Performance benchmarks (informational)	24s
API integration tests + coverage (windows-latest)	53s
Frontend unit tests (vitest) (ubuntu-latest)	17s
API integration tests + coverage (ubuntu-latest)	21s
pytest (ubuntu-latest)	43s
Verify prod requirements.txt is sufficient	10s
API integration tests + coverage (macos-latest)	26s
Frontend unit tests (vitest) (macos-latest)	22s
ruff + pip-audit (windows-latest)	1m 26s
pytest (macos-latest)	41s
pytest (windows-latest)	1m 6s
Frontend unit tests (vitest) (windows-latest)	48s
ruff + pip-audit (ubuntu-latest)	22s
ruff + pip-audit (macos-latest)	21s
	8m 42s

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