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, 9 deletions

diff --git a/vendor/hyper/src/common/task.rs b/vendor/hyper/src/common/task.rs
deleted file mode 100644
index 41671b14..00000000
--- a/vendor/hyper/src/common/task.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-use std::task::{Context, Poll};
-
-/// A function to help "yield" a future, such that it is re-scheduled immediately.
-///
-/// Useful for spin counts, so a future doesn't hog too much time.
-pub(crate) fn yield_now(cx: &mut Context<'_>) -> Poll<std::convert::Infallible> {
-    cx.waker().wake_by_ref();
-    Poll::Pending
-}