chore(ai): centralize guardrail scripts under .ai; add resolve_repo_root; add shims for .junie/.nolik; fix gitea contexts in release.yml

Co-authored-by: Junie <junie@jetbrains.com>

.ai/scripts/lib/common.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Common helpers for AI guardrail scripts
+
+# Robustly resolve the repository root directory.
+# Strategy: prefer Git; fallback to marker search upwards; last resort: current dir.
+resolve_repo_root() {
+  local start
+  start="${1:-$(cd -- "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)}"
+  if command -v git >/dev/null 2>&1; then
+    if git -C "$start" rev-parse --show-toplevel >/dev/null 2>&1; then
+      git -C "$start" rev-parse --show-toplevel
+      return 0
+    fi
+  fi
+  local dir
+  dir="$(cd "$start" && pwd)"
+  while [ "$dir" != "/" ]; do
+    if [ -f "$dir/gradlew" ] || [ -f "$dir/settings.gradle.kts" ] || [ -d "$dir/.git" ]; then
+      echo "$dir"
+      return 0
+    fi
+    dir="$(dirname "$dir")"
+  done
+  pwd
+}