docs: move public docs generation to local workflow

scripts/generate-public-docs.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(git rev-parse --show-toplevel 2>/dev/null || pwd)"
+cd "$ROOT"
+
+mkdir -p docs/generated docs/diagrams docs/public
+
+scripts/docs/generate-all.sh
+
+if [ ! -d docs/public ] || [ -z "$(find docs/public -mindepth 1 -print -quit)" ]; then
+  echo "ERROR: docs/public is missing or empty after generation." >&2
+  exit 1
+fi
+
+echo "Public docs generated in docs/public. Review changes before commit."