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, 49 deletions

diff --git a/vendor/arrayvec/src/errors.rs b/vendor/arrayvec/src/errors.rs
deleted file mode 100644
index 380742a8..00000000
--- a/vendor/arrayvec/src/errors.rs
+++ /dev/null
@@ -1,49 +0,0 @@
-use std::fmt;
-#[cfg(feature="std")]
-use std::any::Any;
-#[cfg(feature="std")]
-use std::error::Error;
-
-/// Error value indicating insufficient capacity
-#[derive(Clone, Copy, Eq, Ord, PartialEq, PartialOrd)]
-pub struct CapacityError<T = ()> {
-    element: T,
-}
-
-impl<T> CapacityError<T> {
-    /// Create a new `CapacityError` from `element`.
-    pub fn new(element: T) -> CapacityError<T> {
-        CapacityError {
-            element: element,
-        }
-    }
-
-    /// Extract the overflowing element
-    pub fn element(self) -> T {
-        self.element
-    }
-
-    /// Convert into a `CapacityError` that does not carry an element.
-    pub fn simplify(self) -> CapacityError {
-        CapacityError { element: () }
-    }
-}
-
-const CAPERROR: &'static str = "insufficient capacity";
-
-#[cfg(feature="std")]
-/// Requires `features="std"`.
-impl<T: Any> Error for CapacityError<T> {}
-
-impl<T> fmt::Display for CapacityError<T> {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", CAPERROR)
-    }
-}
-
-impl<T> fmt::Debug for CapacityError<T> {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}: {}", "CapacityError", CAPERROR)
-    }
-}
-