v0.13.0

Changes

• asinfo: get_asinfo_map() now fills ASNs missing from RIPE NCC asn.txt
  using the five RIR delegated stats files (ARIN, RIPE NCC, APNIC, LACNIC,
  AFRINIC). asn.txt lags behind new allocations by days to weeks; the
  delegated stats are authoritative, daily-updated allocation records and
  cover newly-allocated ASNs. Only allocated/assigned records are used
  (reserved/available ranges excluded). Filled entries carry the allocated
  country code and an "UNKNOWN" name (delegated stats do not include
  names); optional enrichment fields (as2org, population, hegemony,
  peeringdb) are looked up from the already-loaded datasets, so
  get_preferred_name() resolves real names for filled ASNs registered in
  PeeringDB/as2org. Fetch failures for individual files are logged and
  skipped (best-effort).
• New source-faithful irr and delegated parsing APIs separate acquisition
  and parsing from AsInfo enrichment policy. IRR records preserve attribute
  order and unsupported object classes; explicit IRR source selections are
  validated, while with_irr() loads every catalogued source.
• asinfo: added Minimum, Default, and Full loading profiles. Default
  matches the existing asninfo v1 sources; Full adds delegated statistics,
  all IRR sources, and typed Ipv4Net/Ipv6Net route prefixes.
• asinfo: load_asinfo(bool, bool, bool, bool) is deprecated in favor of
  load_asinfo_with_profile() / load_asinfo_with(); the boolean form remains
  as a compatibility shim with identical behavior.
• asinfo: absent enrichment fields are omitted during serialization, while
  old cache records without delegated or irr remain deserializable.
• asinfo: optional enrichment datasets (as2org, population, hegemony,
  peeringdb) in get_asinfo_map() now fail soft: a download or API error
  (e.g., PeeringDB rate limiting without PEERINGDB_API_KEY) logs a warning
  and proceeds with that dataset's fields as None instead of failing the
  entire load. Core asn.txt + delegated-stats data still propagates load
  errors.