hotfix: add module-level 'import re as _re' for _JR_* regex bundle

The judgment-reader regex constants (_JR_BRACKET_HEADER_RE etc.) reference
_re at module scope but _re was only imported inside functions. Module load
failed on HF with NameError. Local dev never caught this because uvicorn
auto-reload caches the partial module state.

tau_rag/api/fastapi_app.py

@@ -22679,6 +22679,7 @@ def doctrines_get_one(doctrine_id: str):  # type: ignore
 # ──────────────────────────────────────────────────────────────────────
 
 # Strip the same corpus prefix the hierarchical_graph uses.
+import re as _re  # module-level alias for the _JR_* regex bundle below
 _JR_BRACKET_HEADER_RE = _re.compile(r"^(?:\s*\[[^\]]*\]\s*)+", flags=_re.UNICODE)
 _JR_PROSE_MARKER_RE = _re.compile(
     r"^\s*פסיק[הת]\s*[—–\-:]\s*[^:]+\)\s*:\s*", flags=_re.UNICODE)