cidrwalk 0.3.0

cidrwalk 0.3.0

cidrwalk 0.3.0 adopts swift-cidr 0.9 and makes network range endpoints
retain their input prefix context. This release intentionally changes
network-mode JSON boundaries and rejects redundant network pairs.

Output compatibility

• In network mode, rangeStart is the lowest first address and rangeEnd is
  the highest last address across the inputs. Each boundary retains the prefix
  length of the network that supplies it, rather than becoming /32 or /128.
• For 10.0.0.0/24 and 10.0.2.0/25, the JSON boundaries are
  10.0.0.0/24 and 10.0.2.127/25. The summarized prefixes remain
  10.0.0.0/23 and 10.0.2.0/25.
• For 2001:db8::/126 and 2001:db8::8/127, the JSON boundaries are
  2001:db8::/126 and 2001:db8::9/127.
• JSON field names are unchanged. The inputs array preserves canonical
  networks in command-line order. Reversing valid inputs preserves the
  boundaries and summarized prefixes.
• Address mode still requires /32 or /128 host endpoints. Deterministic
  IPv6 text and the envelope summarization algorithm are unchanged.

Input validation

• Network inputs must use the same address family, be different after
  canonicalization, and neither may contain the other.
• Equal, canonically equivalent, and nested network pairs now produce a
  validation error on stderr, a nonzero exit status, and no summary output.
  Mixed-family inputs continue to be rejected.
• Distinct adjacent networks and host-length networks remain valid.
• The summary covers the entire envelope between the boundaries, including
  any gap between the two networks.

Dependency boundary

• The swift-cidr requirement is now >= 0.9.0 and < 0.10.0.
• Package.resolved records the reviewed swift-cidr 0.9.0 implementation.
• Building from source now requires Swift 6.2 or newer.

Release integrity

• Signed annotated tags are verified before packaging.
• Native macOS and Linux archives are provided for arm64 and x86-64, with
  LICENSE, THIRD_PARTY_NOTICES.txt, and a shared SHA256SUMS file.
• Linux archives statically include the Swift runtime and are checked in
  Ubuntu 22.04 containers without a Swift installation.