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, 7 insertions, 0 deletions

diff --git a/vendor/github.com/jzelinskie/stringz/README.md b/vendor/github.com/jzelinskie/stringz/README.md
new file mode 100644
index 00000000..befa226b
--- /dev/null
+++ b/vendor/github.com/jzelinskie/stringz/README.md
@@ -0,0 +1,7 @@
+# stringz
+
+[![Go Report Card](https://goreportcard.com/badge/github.com/jzelinskie/stringz?style=flat-square)](https://goreportcard.com/report/github.com/jzelinskie/stringz)
+[![Godoc](http://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)](https://godoc.org/github.com/jzelinskie/stringz)
+[![LICENSE](https://img.shields.io/github/license/jzelinskie/stringz.svg?style=flat-square)](https://github.com/jzelinskie/stringz/blob/master/LICENSE)
+
+Package stringz provides string manipulations not found in the standard library.