docs(CUST-WP-0054-T05): Phase 4 sweep checkout migration evidence

Record railiance01 clone tree, host_paths registration, and tooling for
bulk clone and path registration. Update T05 workplan with Phase 4 completion.

tools/railiance01-register-host-paths.sh

@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+# Register railiance01 host_paths for all State Hub repos.
+# Usage: railiance01-register-host-paths.sh [--dry-run]
+set -euo pipefail
+
+API_BASE="${API_BASE:-http://127.0.0.1:8000}"
+HOST="${RAILIANCE_HOST:-239.62.205.92.host.secureserver.net}"
+CLONE_ROOT="${CLONE_ROOT:-/home/tegwick}"
+DRY_RUN=0
+
+if [[ "${1:-}" == "--dry-run" ]]; then
+  DRY_RUN=1
+fi
+
+repos=$(curl -fsS "${API_BASE}/repos/")
+registered=0
+skipped=0
+
+while IFS= read -r slug; do
+  path="${CLONE_ROOT}/${slug}"
+  current=$(python3 -c "
+import json, sys
+repos = json.load(sys.stdin)
+for r in repos:
+    if r['slug'] == sys.argv[1]:
+        print((r.get('host_paths') or {}).get(sys.argv[2], ''))
+        break
+" <<<"${repos}" "${slug}" "${HOST}")
+  if [[ "${current}" == "${path}" ]]; then
+    echo "OK   ${slug}"
+    skipped=$((skipped + 1))
+    continue
+  fi
+  if [[ "${DRY_RUN}" -eq 1 ]]; then
+    echo "DRY  ${slug} host_paths[${HOST}]=${path} (was: ${current:-<empty>})"
+    continue
+  fi
+  curl -fsS -X POST "${API_BASE}/repos/${slug}/paths" \
+    -H "Content-Type: application/json" \
+    -d "{\"host\": \"${HOST}\", \"path\": \"${path}\"}" >/dev/null
+  echo "POST ${slug} -> ${path}"
+  registered=$((registered + 1))
+done < <(python3 -c "
+import json, sys
+for r in sorted(json.load(sys.stdin), key=lambda x: x['slug']):
+    print(r['slug'])
+" <<<"${repos}")
+
+echo "done: registered=${registered} unchanged=${skipped}"