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, 33 deletions

diff --git a/vendor/rustix/src/rand/getrandom.rs b/vendor/rustix/src/rand/getrandom.rs
deleted file mode 100644
index 69af9a3d..00000000
--- a/vendor/rustix/src/rand/getrandom.rs
+++ /dev/null
@@ -1,33 +0,0 @@
-//! Wrappers for `getrandom`.
-
-#![allow(unsafe_code)]
-
-use crate::buffer::Buffer;
-use crate::{backend, io};
-
-pub use backend::rand::types::GetRandomFlags;
-
-/// `getrandom(buf, flags)`—Reads a sequence of random bytes.
-///
-/// This is a very low-level API which may be difficult to use correctly. Most
-/// users should prefer to use [`getrandom`] or [`rand`] APIs instead.
-///
-/// This function is implemented using a system call, and not the
-/// [vDSO mechanism] introduced in Linux 6.11. See [#1185] for details.
-///
-/// [`getrandom`]: https://crates.io/crates/getrandom
-/// [`rand`]: https://crates.io/crates/rand
-/// [vDSO mechanism]: https://lwn.net/Articles/983186/
-/// [#1185]: https://github.com/bytecodealliance/rustix/issues/1185
-///
-/// # References
-///  - [Linux]
-///
-/// [Linux]: https://man7.org/linux/man-pages/man2/getrandom.2.html
-#[inline]
-pub fn getrandom<Buf: Buffer<u8>>(mut buf: Buf, flags: GetRandomFlags) -> io::Result<Buf::Output> {
-    // SAFETY: `getrandom` behaves.
-    let len = unsafe { backend::rand::syscalls::getrandom(buf.parts_mut(), flags)? };
-    // SAFETY: `getrandom` behaves.
-    unsafe { Ok(buf.assume_init(len)) }
-}