Retire GitHub automation that is disabled, non-functional, unowned, or
explicitly no longer wanted, together with its orphaned support code and
tests.
This removes the optional Dependabot version-update config; automatic
team mentions and cc-review requests; last-successful and nightly branch
advancement; reviewer pings; the disabled PR-comment bot; and the unused
CI-resource upload path. Active CI, release, tvm-bot, and manual
Docker-update workflows remain, with narrower permissions and event
guards, plus refreshed issue-template and network-resource guidance.
The behavior change is intentional: reviewer requests and team routing
become manual, and the nightly and last-successful branches are no
longer advanced by this repository. Dependabot security updates remain
controlled by repository settings.
Tianqi Chen