v0.13.3 — sheleg-dev

• The release refuses a lightweight tag. release.yml gains one step, right after
  checkout and before any gate: git cat-file -t on the tag must print tag; a commit
  fails the job with the remedy (git tag -a <tag> -m '<release>' at the same commit)
  before anything is published. git describe and git submodule status see annotated
  tags only, and the 2026-10-09 family wave cut four lightweight member tags that the
  umbrella then read as each member's previous release. The step is identical across the
  family (umbrella plan 2026-10-10, T5 / REQ-6). Published tags are not re-cut.
• No skill, reference or installer change.