"""Middleware package for the FastAPI app.

Stage 2 ships :mod:`src.api.middleware.csrf` — see CONTRACT.md §3 +
BACKEND_BUILD.md §6.4 for the CSRF strategy. Other middlewares
(request-id correlation, slow-query diagnostics, repo→error mapping)
land in later stages per BACKEND_BUILD.md §4.
"""

__all__: list[str] = []