Move maintainer tooling out of the repo

Git hooks, the upstream sweep and the SBo delivery workflow are the
maintainer's operational tools, not package knowledge. They now live in a
private workspace that wraps all three SlackBuild repos, with one shared
copy of each hook instead of three drifting ones.

Also in this pass:
- AGENTS.md: checksum loop documented as sbodl (sbofixinfo does not fix
  checksums), nvchecker must not run without a token config, prefer
  use_latest_release over use_max_tag
- README: Git Hooks section replaced by a short Contributing note
- sweep report renamed to LAST_SWEEP.md across all three repos

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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