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, 35 deletions

diff --git a/vendor/displaydoc/tests/no_std/enum_prefix_missing.rs b/vendor/displaydoc/tests/no_std/enum_prefix_missing.rs
deleted file mode 100644
index 71710726..00000000
--- a/vendor/displaydoc/tests/no_std/enum_prefix_missing.rs
+++ /dev/null
@@ -1,35 +0,0 @@
-#![cfg_attr(not(feature = "std"), allow(internal_features), feature(lang_items, start))]
-#![cfg_attr(not(feature = "std"), no_std)]
-
-#[cfg_attr(not(feature = "std"), start)]
-fn start(_argc: isize, _argv: *const *const u8) -> isize {
-    0
-}
-#[lang = "eh_personality"]
-#[no_mangle]
-#[cfg(not(feature = "std"))]
-pub extern "C" fn rust_eh_personality() {}
-#[panic_handler]
-#[cfg(not(feature = "std"))]
-fn panic(_info: &core::panic::PanicInfo) -> ! {
-    unsafe {
-        libc::abort();
-    }
-}
-
-use displaydoc::Display;
-
-#[derive(Display)]
-#[prefix_enum_doc_attributes]
-enum TestType {
-    /// this variant is too
-    Variant1,
-
-    /// this variant is two
-    Variant2,
-}
-
-static_assertions::assert_impl_all!(TestType: core::fmt::Display);
-
-#[cfg(feature = "std")]
-fn main() {}