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, 32 deletions

diff --git a/vendor/errno/src/hermit.rs b/vendor/errno/src/hermit.rs
deleted file mode 100644
index 331b6b15..00000000
--- a/vendor/errno/src/hermit.rs
+++ /dev/null
@@ -1,32 +0,0 @@
-//! Implementation of `errno` functionality for RustyHermit.
-//!
-//! Currently, the error handling in RustyHermit isn't clearly
-//! defined. At the current stage of RustyHermit, only a placeholder
-//! is provided to be compatible to the classical errno interface.
-
-// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-use crate::Errno;
-
-pub fn with_description<F, T>(_err: Errno, callback: F) -> T
-where
-    F: FnOnce(Result<&str, Errno>) -> T,
-{
-    callback(Ok("unknown error"))
-}
-
-pub const STRERROR_NAME: &str = "strerror_r";
-
-pub fn errno() -> Errno {
-    Errno(0)
-}
-
-pub fn set_errno(_: Errno) {}