docs: single status list - dissolve audit restliste, slim AI context

- MASTER_TODO.md is now the only status list: parked decisions point to
  DECISIONS.md, done log capped at 5 condensed entries
- delete AUDIT_2026-05-25_TODO.md (open items and parked decisions fully
  covered by MASTER_TODO/DECISIONS)
- AI_CONTEXT.md: drop duplicated status block, keep rules and pointers
- EXTERNAL_DEPENDENCIES.md: condense review log to recent entries
- fix references in DR_WORKSTATION_SETUP, EXTERNAL_OPERATOR_RUNBOOK,
  STORAGE_LAYOUT, REPO_MAP, docs/README

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/REPO_MAP.md

@@ -33,7 +33,8 @@ Details gilt immer die betroffene Compose-Datei oder das jeweilige Runbook.
 | `docs/RESTORE_MATRIX.md` | Restore-Quelle je Dienst |
 | `docs/SECRETS_MAP.md` | Secret-Namen und Pfade ohne Werte |
 | `docs/GITOPS_DRIFT_RUNBOOK.md` | Git/Gitea/Komodo/Docker/Host-Drift |
-| `docs/AUDIT_2026-05-25_TODO.md` | aktuelle Restliste |
+| `docs/MASTER_TODO.md` | einzige operative Statusliste |
+| `docs/DECISIONS.md` | Entscheidungs-Register (ADR-light) |
 | `docs/DR_WORKSTATION_SETUP.md` | Schritt-fuer-Schritt-Runbook fuer den DR-Gaming-PC (WSL2 + Borg-Client + SSH-Keys) |
 | `docs/runbooks/komodo-bulk-deploy-dns.md` | Bulk-Deploy-Pulls scheitern an DNS, wenn AdGuard im selben Batch recreated wird |