Function scanStaleProvenance

scanStaleProvenance(
text: string,
referenceDate?: Date,
): { retrievedAt: string; ageMonths: number }[]
Scan economicProvenance blocks for stale vintage (>6 months without annotation). Returns stale entries.
Provenance blocks look like:
```
economicProvenance:
  provider: imf
  ...
  retrieved_at: 2026-01-15
```
or inline: retrieved_at: 2026-01-15
Parameters
- text: string
- referenceDate: Date = ...
Returns { retrievedAt: string; ageMonths: number }[]
- Defined in scripts/validators/article/rules/stale-provenance.ts:30