tasks(books-ssh-audit-shared-vds): close 🟢 — audit clean (1 retained, 0 revoked)

SSH audit на shared VDS vds-kzntsv (89.253.255.94, hosts books Slovo +
Bookva в shared compose-стеке) перед Phase 3 cutover'ом tenant-split.

Findings:
- 1 retained key: vitya@DESKTOP-NSEF0UK (core dev, sole admin)
- 0 keys to revoke — никаких analyst / former employee / unknown keys
- 1 cosmetic cleanup: removed dead root authorized_keys entry (was
  duplicate of vitya's key, dead из-за `permitrootlogin no`)
- sshd hardening verified via `sshd -T` (effective config: root-no,
  password-no, kbd-no). **Gotcha** noted: raw grep of /etc/ssh/sshd_config
  shows defaults; sshd_config.d/ overrides делают effective. Future
  audits use `sshd -T`, not raw grep.
- fail2ban active, 2670 failed / 37 banned hist, currently 0
- last 7 days journalctl ssh: только vitya@94.19.247.14 (мой home IP)

Acceptance per spec (Фаза 3, шаг 2 tenant-split):
✅ authorized_keys reviewed
✅ Non-core keys revoked (N/A — none existed)
✅ Analyst keys revoked (N/A — never issued)
✅ Documented in .wiki/concepts/books-ssh-access.md

Ingest: .wiki/concepts/books-ssh-access.md — retained keys table +
sshd state + fail2ban + login history + add/revoke processes +
cross-refs. Logged + indexed.

STATUS.md ⚪ block → ARCHIVE.md (per-task file kept in .tasks/).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.wiki/index.md

@@ -18,6 +18,7 @@ Catalog of all wiki pages. One line per page, organized by type. Updated on ever
 ## Concepts
 
 - [admin-infra-project](concepts/admin-infra-project.md) — design + migration plan для OpeItcLoc03/admin (canonical)
+- [books-ssh-access](concepts/books-ssh-access.md) — SSH access audit на shared VDS (books Slovo+Bookva), retained keys + add/revoke processes
 - [compose-bcrypt-escape-trap](concepts/compose-bcrypt-escape-trap.md) — Docker Compose ест `$` в bcrypt hashes
 - [db-tls-self-signed-via-traefik-raw-tcp](concepts/db-tls-self-signed-via-traefik-raw-tcp.md) — DB TLS через traefik raw TCP с self-signed certs
 - [docker-host-loopback-detect](concepts/docker-host-loopback-detect.md) — Docker host-loopback detection — как доказать что host.docker.internal не петля