chore: update skill-readmes task — infra cluster done

Marked READMEs for project-bootstrap, setup-wiki, setup-tasks,
using-wiki, using-tasks as completed. Next-action points at the
caveman cluster (or other groups) for the next batch.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.tasks/skill-readmes.md

@@ -20,6 +20,10 @@ Write English `README.md` for every skill source under `skills/`, plus translate
 ## Completed steps
 - [x] `project-bootstrap` README — `skills/project-bootstrap/README.md`
 - [x] Root README EN translation — `README.md` (EN) + `README.ru.md` (original RU, fixed broken `.wiki/source/...` link)
+- [x] `setup-wiki` README
+- [x] `setup-tasks` README
+- [x] `using-wiki` README
+- [x] `using-tasks` README
 
 ## Notes
 - Skills with README already: `caveman-compress` (different style — keep as-is, do not normalize for now).