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, 38 deletions

diff --git a/vendor/bitflags/src/tests/from_bits_retain.rs b/vendor/bitflags/src/tests/from_bits_retain.rs
deleted file mode 100644
index 1ae28a66..00000000
--- a/vendor/bitflags/src/tests/from_bits_retain.rs
+++ /dev/null
@@ -1,38 +0,0 @@
-use super::*;
-
-use crate::Flags;
-
-#[test]
-fn cases() {
-    case(0, TestFlags::from_bits_retain);
-    case(1, TestFlags::from_bits_retain);
-    case(1 | 1 << 1 | 1 << 2, TestFlags::from_bits_retain);
-
-    case(1 << 3, TestFlags::from_bits_retain);
-    case(1 | 1 << 3, TestFlags::from_bits_retain);
-
-    case(1 | 1 << 1, TestOverlapping::from_bits_retain);
-
-    case(1 << 1, TestOverlapping::from_bits_retain);
-
-    case(1 << 5, TestExternal::from_bits_retain);
-}
-
-#[track_caller]
-fn case<T: Flags>(input: T::Bits, inherent: impl FnOnce(T::Bits) -> T)
-where
-    <T as Flags>::Bits: std::fmt::Debug + PartialEq,
-{
-    assert_eq!(
-        input,
-        inherent(input).bits(),
-        "T::from_bits_retain({:?})",
-        input
-    );
-    assert_eq!(
-        input,
-        T::from_bits_retain(input).bits(),
-        "Flags::from_bits_retain({:?})",
-        input
-    );
-}