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, 33 deletions

diff --git a/vendor/potential_utf/src/lib.rs b/vendor/potential_utf/src/lib.rs
deleted file mode 100644
index 2b343c9c..00000000
--- a/vendor/potential_utf/src/lib.rs
+++ /dev/null
@@ -1,33 +0,0 @@
-// This file is part of ICU4X. For terms of use, please see the file
-// called LICENSE at the top level of the ICU4X source tree
-// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
-
-#![cfg_attr(not(any(test, doc)), no_std)]
-#![cfg_attr(
-    not(test),
-    deny(
-        clippy::indexing_slicing,
-        clippy::unwrap_used,
-        clippy::expect_used,
-        clippy::panic,
-        clippy::exhaustive_structs,
-        clippy::exhaustive_enums,
-        clippy::trivially_copy_pass_by_ref,
-        missing_debug_implementations,
-    )
-)]
-
-//! A crate providing unvalidated string and character types.
-
-#[cfg(feature = "alloc")]
-extern crate alloc;
-
-mod uchar;
-mod ustr;
-
-pub use uchar::PotentialCodePoint;
-pub use ustr::PotentialUtf16;
-pub use ustr::PotentialUtf8;
-
-#[cfg(feature = "writeable")]
-mod writeable;