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, 20 deletions

diff --git a/vendor/rustversion/tests/test_eval.rs b/vendor/rustversion/tests/test_eval.rs
deleted file mode 100644
index c044e859..00000000
--- a/vendor/rustversion/tests/test_eval.rs
+++ /dev/null
@@ -1,20 +0,0 @@
-#[rustversion::any(
-    stable,
-    stable(1.34),
-    stable(1.34.0),
-    beta,
-    nightly,
-    nightly(2020-02-25),
-    since(1.34),
-    since(2020-02-25),
-    before(1.34),
-    before(2020-02-25),
-    not(nightly),
-    all(stable, beta, nightly),
-)]
-fn success() {}
-
-#[test]
-fn test() {
-    success();
-}