chore(docs): add prune-docs maintenance script for future use

scripts/maintenance/prune-docs.sh

@@ -0,0 +1,78 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Hard prune docs to a strict whitelist. Everything else under docs/ is removed.
+# Keep directories required by validator, and the minimal doc set we agreed on.
+
+ROOT_DIR=$(cd "$(dirname "$0")/../.." && pwd)
+cd "$ROOT_DIR"
+
+WHITELIST=(
+  "docs/index.md"
+  "docs/overview/system-overview.md"
+  "docs/how-to/start-local.md"
+  "docs/how-to/deploy-proxmox-nginx.md"
+  "docs/api/README.md"
+  "docs/api/members-api.md"        # kept to satisfy link in API README
+  "docs/api/generated"             # keep generated OpenAPI specs
+  "docs/reference/ports-and-urls.md"
+  "docs/now/current.md"
+  "docs/now/TEMPLATE.md"
+  "docs/now/README.md"
+  "docs/proxmox-nginx/meldestelle.conf"
+  "docs/architecture/c4"           # keep all C4 diagrams
+  "docs/architecture/adr"          # keep all ADRs
+  # Note: Do NOT include generic directories like 'docs' or 'docs/api' here,
+  # because prefix matching would whitelist everything under them. We'll recreate
+  # required empty directories after pruning.
+)
+
+is_whitelisted() {
+  local path="$1"
+  for keep in "${WHITELIST[@]}"; do
+    # exact match
+    if [[ "$path" == "$keep" ]]; then
+      return 0
+    fi
+    # directory prefix match
+    if [[ -d "$keep" && "$path" == $keep/* ]]; then
+      return 0
+    fi
+  done
+  return 1
+}
+
+# Remove all tracked files under docs/ that are not whitelisted
+mapfile -t FILES < <(git ls-files docs)
+
+REMOVED=0
+for f in "${FILES[@]}"; do
+  if ! is_whitelisted "$f"; then
+    git rm -r -q "$f"
+    ((REMOVED++)) || true
+  fi
+done
+
+echo "Removed $REMOVED files not in whitelist."
+
+# Ensure required directories exist (even if empty) for validator
+mkdir -p docs docs/api docs/architecture docs/development docs/how-to docs/overview docs/now docs/proxmox-nginx docs/reference
+
+# Optionally remove empty directories that are not needed anymore (except required ones)
+# Find empty directories under docs and remove them, but skip the required ones above
+find docs -type d -empty \
+  ! -path "docs" \
+  ! -path "docs/api" \
+  ! -path "docs/architecture" \
+  ! -path "docs/development" \
+  ! -path "docs/how-to" \
+  ! -path "docs/overview" \
+  ! -path "docs/now" \
+  ! -path "docs/proxmox-nginx" \
+  ! -path "docs/reference" \
+  -print -delete || true
+
+# Stage only docs directory updates created by find
+git add -A docs
+
+echo "Docs prune completed. Review changes and commit."