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, 43 deletions

diff --git a/vendor/educe/src/common/mod.rs b/vendor/educe/src/common/mod.rs
deleted file mode 100644
index 79e10bb9..00000000
--- a/vendor/educe/src/common/mod.rs
+++ /dev/null
@@ -1,43 +0,0 @@
-#[allow(dead_code)]
-pub(crate) mod bound;
-#[allow(dead_code)]
-pub(crate) mod path;
-#[allow(dead_code)]
-pub(crate) mod r#type;
-#[allow(dead_code)]
-pub(crate) mod where_predicates_bool;
-
-#[cfg(feature = "Default")]
-#[allow(dead_code)]
-pub(crate) mod expr;
-#[cfg(any(
-    feature = "Debug",
-    feature = "PartialEq",
-    feature = "PartialOrd",
-    feature = "Ord",
-    feature = "Hash",
-    feature = "Default"
-))]
-#[allow(dead_code)]
-pub(crate) mod ident_bool;
-#[cfg(any(
-    feature = "Debug",
-    feature = "PartialEq",
-    feature = "PartialOrd",
-    feature = "Ord",
-    feature = "Hash",
-    feature = "Deref",
-    feature = "DerefMut",
-    feature = "Into"
-))]
-#[allow(dead_code)]
-pub(crate) mod ident_index;
-#[cfg(any(feature = "PartialOrd", feature = "Ord"))]
-#[allow(dead_code)]
-pub(crate) mod int;
-#[cfg(any(feature = "Debug", feature = "PartialEq", feature = "Hash"))]
-#[allow(dead_code)]
-pub(crate) mod unsafe_punctuated_meta;
-
-#[cfg(any(feature = "PartialOrd", feature = "Ord", feature = "Into"))]
-pub(crate) mod tools;