v1.5.4

Fixes

• Windows: ASCII output is selected automatically on the legacy console host
  (cmd.exe / PowerShell outside Windows Terminal, VS Code, ConEmu), whose
  fonts draw the pulse blocks and the spinner as boxes. SPING_ASCII=0 forces
  the Unicode charset on any terminal.
• The ASCII pulse uses four marks of increasing height (_ - = ")
  instead of eight unrelated ones.
• IPv6 targets: the Init: and Context lines show the real source address,
  interface and prefix (if lo · ::1/128) instead of 0.0.0.0/0, and the
  target is classified like IPv4 (::1 and unique-local fc00::/7 are
  routed internal, an address inside the local prefix is same LAN); ::1
  was reported as public. Linux: ICMPv6 replies now carry their hop limit
  in the ttl column; it was 0.

Docs

• README: project logo. The logo and the recordings carry no provenance
  manifest or tool metadata, only what the image format needs.