Find VA (Department of Veterans Affairs) facilities by location.
Search for VA medical centers, clinics, benefits offices, cemeteries,
and vet centers. At least one location parameter should be provided.
Args:
state: Two-letter state abbreviation (e.g., "CA", "TX").
city: City name to search in.
zip_code: 5-digit ZIP code to search near.
facility_type: Type of facility — "health" (medical centers/clinics),
"benefits" (regional benefits offices), "cemetery" (national
cemeteries), or "vet_center" (readjustment counseling). Default "health".
limit: Maximum number of results (default 25, max 200).