docs: AI project context (docs/ai) and repository documentation refresh

- docs/ai/: stable, repo-verified context - README, architecture, tech-stack,
  edge-cases, plan (confirmed active work only), migration-tofu (the blue-green
  OpenTofu migration runbook and per-service findings), legacy-warning, links.
- AGENTS.md: slimmed to a working contract that points at docs/ai instead of
  restating it; CLAUDE.md is an adapter that @-includes it.
- README.md, ansible/README.md, ansible/roles/README.md,
  roles/lxc_docker_host/README.md: bring wording in line with the current
  control plane (Makefile entry point, registry, tofu, memoir-bot gone).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012uoq5AVK8mkBgg83Mq6o5V

ansible/roles/lxc_docker_host/README.md

@@ -5,8 +5,8 @@ Docker»: пакеты, проверка `/dev/fuse`, `storage-driver: fuse-over
 запуск демона и базовый UFW.
 
 Роль вынесена из повторяющихся блоков `playbooks/pve-*.yml`
-(gitea, vaultwarden, mihomo, adguard, memoir-bot, docker-test, grimmory,
-hermes-ai) — суммарно около 350 строк копипасты.
+(gitea, vaultwarden, mihomo, adguard, docker-test, grimmory, hermes-ai) —
+суммарно около 350 строк копипасты.
 
 ## Что делает