`curateReport` still read `facts.staleReason`, renamed to `untrustworthyReason`
in dc3b50260 and split into telemetry_stale / telemetry_absent / flow_unmeasured.
The read had been undefined since, so the agent got "untrustworthy" with no why,
and the prompt still told it every such case was stale telemetry.
`facts` is `z.record(z.unknown())`, so nothing typechecked the key. The new test
goes presenter -> reports route JSON -> curateReport without naming a facts key
on the way in, and asserts curation carries every key the presenter emits.
Katia Bulatova
643ea3907f