Adds the tf verb-group and the resolver substrate beneath it, continuing the
v0.1 infra-loop build.
- substrate: findInfraRoot (walk up to terragrunt.hcl + stacks/), stack→dir
resolver, and repo/remote/git-crypt detection (preferRemote forgejo>origin,
hasGitCryptAttr, gitCryptFlags) — the last is for `work` next.
- tf plan/validate/fmt/force-unlock/apply, resolving the stack from cwd and
delegating to scripts/tg (which owns state decrypt/encrypt, the Vault lock,
and the ingress auth-comment check) rather than calling terragrunt directly.
- tf apply is presence-coupled: claims stack:<name>, ALWAYS releases on exit
(normal, error, or SIGINT/SIGTERM via sync.Once + signal handler) — fixing
the documented ~200-claim leak — and prints an out-of-band reminder since CI
applies canonically on push.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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