Change the 5 https.onCall handlers from `data: any` to
`data: Record<string, unknown>`, so payload fields are `unknown` and must go
through the existing validators rather than being implicitly-typed. No behavior
change (every field was already validated); tsc + 53 function tests green.
Left as-is deliberately: `catch (err: unknown)` narrowing (churn, marginal) and
the untyped Tink handles in wrapReleaseKeyCallable (the crypto lib ships no types).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>