refactor(models): narrow Any-typed parse boundary with TypedDict unions #137

Job	Run time
pytest (windows-latest)	57s
Frontend unit tests (vitest) (ubuntu-latest)	16s
Frontend unit tests (vitest) (windows-latest)	1m 1s
mypy	21s
ruff + pip-audit (windows-latest)	41s
API integration tests + coverage (ubuntu-latest)	19s
ruff + pip-audit (ubuntu-latest)	12s
API integration tests + coverage (windows-latest)	1m 8s
Verify prod requirements.txt is sufficient	17s
pytest (ubuntu-latest)	23s
	5m 35s

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