refactor(models): narrow Any-typed parse boundary with TypedDict unions #144

Job	Run time
Verify prod requirements.txt is sufficient	7s
API integration tests + coverage (windows-latest)	1m 5s
pytest (ubuntu-latest)	18s
ruff + pip-audit (windows-latest)	52s
Frontend unit tests (vitest) (ubuntu-latest)	15s
pytest (windows-latest)	1m 9s
Frontend unit tests (vitest) (windows-latest)	40s
ruff + pip-audit (ubuntu-latest)	26s
mypy	21s
API integration tests + coverage (ubuntu-latest)	15s
	5m 28s

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