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, 45 deletions

diff --git a/vendor/bitflags/src/tests/from_bits.rs b/vendor/bitflags/src/tests/from_bits.rs
deleted file mode 100644
index dada9aff..00000000
--- a/vendor/bitflags/src/tests/from_bits.rs
+++ /dev/null
@@ -1,45 +0,0 @@
-use super::*;
-
-use crate::Flags;
-
-#[test]
-fn cases() {
-    case(Some(0), 0, TestFlags::from_bits);
-    case(Some(1), 1, TestFlags::from_bits);
-    case(
-        Some(1 | 1 << 1 | 1 << 2),
-        1 | 1 << 1 | 1 << 2,
-        TestFlags::from_bits,
-    );
-
-    case(None, 1 << 3, TestFlags::from_bits);
-    case(None, 1 | 1 << 3, TestFlags::from_bits);
-
-    case(Some(1 | 1 << 1), 1 | 1 << 1, TestOverlapping::from_bits);
-
-    case(Some(1 << 1), 1 << 1, TestOverlapping::from_bits);
-
-    case(Some(1 << 5), 1 << 5, TestExternal::from_bits);
-}
-
-#[track_caller]
-fn case<T: Flags>(
-    expected: Option<T::Bits>,
-    input: T::Bits,
-    inherent: impl FnOnce(T::Bits) -> Option<T>,
-) where
-    <T as Flags>::Bits: std::fmt::Debug + PartialEq,
-{
-    assert_eq!(
-        expected,
-        inherent(input).map(|f| f.bits()),
-        "T::from_bits({:?})",
-        input
-    );
-    assert_eq!(
-        expected,
-        T::from_bits(input).map(|f| f.bits()),
-        "Flags::from_bits({:?})",
-        input
-    );
-}