Convert the standalone `tea` skill into a skills-dir plugin so commands are
namespaced and an enforcement hook can ship with it:
- /tea:login — pin the project Gitea login into .claude/settings.local.json
- /tea:use — tea CLI reference (was the old root SKILL.md), with the
login rule slimmed since the hook now enforces it
- hooks/tea-guard.sh — PreToolUse(Bash) guard: blocks any `tea` command that
touches Gitea unless it carries --login and $GITEA_LOGIN is set. Exempts
`tea logins list` and `tea --version/--help` so /tea:login can bootstrap.
References moved under skills/use/references/. `claude plugin validate` passes;
guard unit-tested across allow/block cases.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
naudachu