fix(export): surface bulk partial failures via X-Export-Warnings header #141

Job	Run time
mypy	23s
API integration tests + coverage (windows-latest)	55s
ruff + pip-audit (ubuntu-latest)	26s
Frontend unit tests (vitest) (ubuntu-latest)	16s
pytest (windows-latest)	1m 44s
API integration tests + coverage (ubuntu-latest)	18s
Verify prod requirements.txt is sufficient	7s
pytest (ubuntu-latest)	27s
Frontend unit tests (vitest) (windows-latest)	46s
ruff + pip-audit (windows-latest)	1m 6s
	6m 28s

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