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, 24 deletions

diff --git a/vendor/rustix/src/io/mod.rs b/vendor/rustix/src/io/mod.rs
deleted file mode 100644
index a2994d74..00000000
--- a/vendor/rustix/src/io/mod.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-//! I/O operations.
-//!
-//! If you're looking for [`SeekFrom`], it's in the [`fs`] module.
-//!
-//! [`SeekFrom`]: crate::fs::SeekFrom
-//! [`fs`]: crate::fs
-
-mod close;
-#[cfg(not(windows))]
-mod dup;
-mod errno;
-#[cfg(not(windows))]
-mod fcntl;
-mod ioctl;
-mod read_write;
-
-pub use close::*;
-#[cfg(not(windows))]
-pub use dup::*;
-pub use errno::{retry_on_intr, Errno, Result};
-#[cfg(not(windows))]
-pub use fcntl::*;
-pub use ioctl::*;
-pub use read_write::*;