chore(metadata): move cleanup commands to cleanup metadata

[cbusillo]

Summary

• move repo closeout cleanup metadata from qualityGate.scripts into cleanup.commands
• mark the warm-cache cleanup as routine closeout evidence
• keep the cold cleanup command as explicit/report-only metadata with when: "cold"

Closes #188

Verification

• jq empty .github/github.json
• /Users/cbusillo/Developer/codex-skills/github/scripts/github-repo-snapshot.sh --json | jq -e '.cleanup.status == "configured" and (.cleanup.routineCommands | length) == 1 and .cleanup.routineCommands[0].command == "just local-cleanup-space --apply --keep-current-fast-cache" and (.cleanup.commands | length) == 2'
• ./build-fast.sh

Notes

• JetBrains closeout was attempted for changed files, but the inspection API returned HTTP 500 before producing findings.