docs: contributor onboarding path and CODEOWNERS #293

Job	Run time
pytest (ubuntu-latest)	42s
Frontend unit tests (vitest) (ubuntu-latest)	28s
pytest (macos-latest)	25s
Frontend unit tests (vitest) (macos-latest)	32s
Verify prod requirements.txt is sufficient	7s
ruff + pip-audit (windows-latest)	1m 1s
pytest (windows-latest)	2m 10s
API integration tests + coverage (windows-latest)	1m 3s
ruff + pip-audit (macos-latest)	27s
API integration tests + coverage (macos-latest)	31s
API integration tests + coverage (ubuntu-latest)	20s
ruff + pip-audit (ubuntu-latest)	25s
mypy	27s
Frontend unit tests (vitest) (windows-latest)	1m 13s
Performance benchmarks (gated)	29s
	10m 20s

Provide feedback