actop 1.9.6

Fixed

• The committed cover snapshot is now byte-deterministic. As shipped in
  1.9.5 it carried the build stamp, whose commit hash and timestamp change on
  every run — so every build-cover-dist.sh invocation dirtied
  docs/cover.html even when nothing about the page had changed, and would
  have permanently tripped this skill's own "clean working tree" gate before
  deploy. The stamp is now stripped from the committed copy only; the published
  dist still carries it. Two consecutive builds from an unchanged source now
  produce identical bytes, so the snapshot changes only when the page or the
  version does.