Github::Client wraps the bearer-auth REST API with required
'X-GitHub-Api-Version: 2022-11-28' header. Implements me, create_pat
(POST /user/personal-access-tokens), delete_pat (DELETE by id).
GithubPatRotator's 4-step contract:
- generate: create_pat returns new id + token value (fresh PAT alongside old)
- apply: no-op (create_pat already active)
- verify: probe-client uses the NEW PAT to GET /user; success means it works
- commit: delete OLD PAT by id (tracked via old_pat_id tag)
- rollback_apply: delete NEW PAT
7 unit specs verify create/delete/me round-trips, full rotation path,
verify-on-401, and rollback deletion.