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, 32 deletions

diff --git a/vendor/block-buffer/Cargo.toml b/vendor/block-buffer/Cargo.toml
deleted file mode 100644
index 4e50744a..00000000
--- a/vendor/block-buffer/Cargo.toml
+++ /dev/null
@@ -1,32 +0,0 @@
-# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
-#
-# When uploading crates to the registry Cargo will automatically
-# "normalize" Cargo.toml files for maximal compatibility
-# with all versions of Cargo and also rewrite `path` dependencies
-# to registry (e.g., crates.io) dependencies.
-#
-# If you are reading this file be aware that the original Cargo.toml
-# will likely look very different (and much more reasonable).
-# See Cargo.toml.orig for the original contents.
-
-[package]
-edition = "2018"
-name = "block-buffer"
-version = "0.10.4"
-authors = ["RustCrypto Developers"]
-description = "Buffer type for block processing of data"
-documentation = "https://docs.rs/block-buffer"
-readme = "README.md"
-keywords = [
-    "block",
-    "buffer",
-]
-categories = [
-    "cryptography",
-    "no-std",
-]
-license = "MIT OR Apache-2.0"
-repository = "https://github.com/RustCrypto/utils"
-
-[dependencies.generic-array]
-version = "0.14"