Find every company a person runs or represents - across BOTH registers in one
call (cross-border person search). Read-only.
Parameters:
- name (required): person name substring, case-insensitive, e.g. "Mustermann".
- country (optional, default "all"): "AT" | "DE" | "all".
- page_size (optional, default 25): results per country.
- status (optional, default "all"): "active" | "inactive" | "all".
Returns the merged search_companies envelope ({countries, results, per_country,
notices}) plus ``person_query``; every result card carries ``country``,
``company_id`` and the matched manager. AT matches the primary managing director,
DE matches all managing directors AND registered signatories. IMPORTANT: matching
is by name and the registers publish birth YEAR only - a shared name across
companies or countries does not prove the same person (the notice says so; use
birth years and context to corroborate). For general company search use
search_companies with other filters; manager_name can be combined there too.