docs: add 0.2.0 changelog for lock-order and parity work #331

Job	Run time
Verify prod requirements.txt is sufficient	10s
mypy	23s
pytest (macos-latest)	52s
Frontend unit tests (vitest) (windows-latest)	55s
Performance benchmarks (gated)	38s
pytest (ubuntu-latest)	57s
ruff + pip-audit (macos-latest)	32s
API integration tests + coverage (ubuntu-latest)	21s
Frontend unit tests (vitest) (macos-latest)	34s
API integration tests + coverage (macos-latest)	16s
Frontend unit tests (vitest) (ubuntu-latest)	27s
API integration tests + coverage (windows-latest)	1m 2s
ruff + pip-audit (ubuntu-latest)	23s
ruff + pip-audit (windows-latest)	1m 4s
pytest (windows-latest)	1m 39s
	10m 13s

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