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, 28 deletions

diff --git a/vendor/security-framework-sys/src/digest_transform.rs b/vendor/security-framework-sys/src/digest_transform.rs
deleted file mode 100644
index fdcf6ee2..00000000
--- a/vendor/security-framework-sys/src/digest_transform.rs
+++ /dev/null
@@ -1,28 +0,0 @@
-use core_foundation_sys::base::{CFIndex, CFTypeRef};
-use core_foundation_sys::error::CFErrorRef;
-use core_foundation_sys::string::CFStringRef;
-
-use crate::transform::SecTransformRef;
-
-extern "C" {
-    pub static kSecDigestHMACKeyAttribute: CFStringRef;
-    pub static kSecDigestHMACMD5: CFStringRef;
-    pub static kSecDigestHMACSHA1: CFStringRef;
-    pub static kSecDigestHMACSHA2: CFStringRef;
-    pub static kSecDigestLengthAttribute: CFStringRef;
-    pub static kSecDigestMD2: CFStringRef;
-    pub static kSecDigestMD4: CFStringRef;
-    pub static kSecDigestMD5: CFStringRef;
-    pub static kSecDigestSHA1: CFStringRef;
-    pub static kSecDigestSHA2: CFStringRef;
-    pub static kSecDigestTypeAttribute: CFStringRef;
-
-    pub fn SecDigestTransformCreate(
-        digestType: CFTypeRef,
-        digestLength: CFIndex,
-        error: *mut CFErrorRef,
-    ) -> SecTransformRef;
-
-// this symbol is apparently missing in 10.13.3?
-// pub fn SecDigestTransformGetTypeID() -> CFTypeID;
-}