refactor: shared session load path for session and export APIs (#125) #279

Job	Run time
ruff + pip-audit (macos-latest)	29s
Frontend unit tests (vitest) (macos-latest)	25s
pytest (macos-latest)	44s
pytest (ubuntu-latest)	44s
mypy	20s
Frontend unit tests (vitest) (ubuntu-latest)	29s
ruff + pip-audit (windows-latest)	1m 7s
Frontend unit tests (vitest) (windows-latest)	1m 2s
API integration tests + coverage (windows-latest)	54s
ruff + pip-audit (ubuntu-latest)	20s
API integration tests + coverage (ubuntu-latest)	18s
Performance benchmarks (gated)	34s
API integration tests + coverage (macos-latest)	21s
Verify prod requirements.txt is sufficient	8s
pytest (windows-latest)	1m 23s
	9m 18s

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