feat: migrate from Cedar to SpiceDB authorization system

This is a major architectural change that replaces the Cedar policy-based
authorization system with SpiceDB's relation-based authorization.

Key changes:

- Migrate from Rust to Go implementation
- Replace Cedar policies with SpiceDB schema and relationships
- Switch from envoy `ext_authz` with Cedar to SpiceDB permission checks
- Update build system and dependencies for Go ecosystem
- Maintain Envoy integration for external authorization

This change enables more flexible permission modeling through SpiceDB's
Google Zanzibar inspired relation-based system, supporting complex
hierarchical permissions that were difficult to express in Cedar.

Breaking change: Existing Cedar policies and Rust-based configuration
will no longer work and need to be migrated to SpiceDB schema.

1 files changed, 0 insertions, 41 deletions

diff --git a/vendor/rustix/src/maybe_polyfill/std/mod.rs b/vendor/rustix/src/maybe_polyfill/std/mod.rs
deleted file mode 100644
index 17b28095..00000000
--- a/vendor/rustix/src/maybe_polyfill/std/mod.rs
+++ /dev/null
@@ -1,41 +0,0 @@
-//! Imports from `std` that would be polyfilled for `no_std` builds (see
-//! `src/polyfill/no_std`).
-//!
-//! This implementation is used when `std` is available and just imports the
-//! necessary items from `std`. For `no_std` builds, the file
-//! `src/polyfill/no_std` is used instead, which doesn't depend on the standard
-//! library.
-
-#[cfg(not(windows))]
-pub mod io {
-    pub use std::io::{IoSlice, IoSliceMut};
-}
-
-#[cfg(not(target_os = "wasi"))]
-#[cfg(feature = "net")]
-pub mod net {
-    pub use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
-}
-
-pub mod os {
-    pub mod fd {
-        // Change to use `std::os::fd` when MSRV becomes Rust 1.66 or higher.
-
-        #[cfg(target_os = "wasi")]
-        pub use std::os::fd::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd};
-        #[cfg(unix)]
-        pub use std::os::unix::io::{
-            AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd,
-        };
-    }
-
-    #[cfg(windows)]
-    pub mod windows {
-        pub mod io {
-            pub use std::os::windows::io::{
-                AsRawSocket, AsSocket, BorrowedSocket, FromRawSocket, IntoRawSocket, OwnedSocket,
-                RawSocket,
-            };
-        }
-    }
-}