Release v6.72.0

What's Changed

• docs(skill): preproc-sets-plusdefines, config.unknown_key and cfg-dispatch.coverage (#748) by @hernloh in #749
• feat(hub): rb hub send cov-focus --by selects the /cov figures (#747) by @hernloh in #750
• dispatch: record the coverage tail job in a run record; sweep orphans before submitting (#745) by @hernloh in #751
• randtest: run the coverage tail for -M cov, dispatched like regression (#746) by @hernloh in #752

Full Changelog: v6.71.0...v6.72.0