feat(safety-net): create WP-0004, update preflight for OAS 5-repo layout

- workplans/RAIL-BS-WP-0004-safety-net.md: ADR-001 workplan file for
  current-env-safety-net workstream (7e8b0c20), T01-T04 done, T05-T06 todo
- tools/cmd/railiance-preflight: update REPOS to OAS S1-S5 stack
  (railiance-infra/cluster/platform/enablement/apps) + project repos;
  remove stale railiance-bootstrap reference
- docs/backup-restore.md: fix Step 5 clone commands to current repo names
- Makefile: add make backup and make preflight targets

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tools/cmd/railiance-preflight

@@ -10,12 +10,21 @@ source "${ROOT}/lib/railiance-print.sh"
 BACKUP_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/railiance/backups"
 MAX_AGE_HOURS=24
 REPOS=(
+  # OAS Stack (S1–S5) — railiance-infra/docs/adr/ADR-003
+  /home/worsch/railiance-infra
+  /home/worsch/railiance-cluster
+  /home/worsch/railiance-platform
+  /home/worsch/railiance-enablement
+  /home/worsch/railiance-apps
+  # Core infrastructure
+  /home/worsch/the-custodian
+  # Project repos
+  /home/worsch/markitect_project
+  /home/worsch/activity-core
+  /home/worsch/net-kingdom
   /home/worsch/issue-facade
   /home/worsch/binect-js
   /home/worsch/kaizen-agentic
-  /home/worsch/railiance-bootstrap
-  /home/worsch/the-custodian
-  /home/worsch/markitect_project
 )
 
 # ── Helpers ───────────────────────────────────────────────────────────────────