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, 25 insertions, 0 deletions

diff --git a/vendor/github.com/stretchr/testify/assert/yaml/yaml_custom.go b/vendor/github.com/stretchr/testify/assert/yaml/yaml_custom.go
new file mode 100644
index 00000000..baa0cc7d
--- /dev/null
+++ b/vendor/github.com/stretchr/testify/assert/yaml/yaml_custom.go
@@ -0,0 +1,25 @@
+//go:build testify_yaml_custom && !testify_yaml_fail && !testify_yaml_default
+// +build testify_yaml_custom,!testify_yaml_fail,!testify_yaml_default
+
+// Package yaml is an implementation of YAML functions that calls a pluggable implementation.
+//
+// This implementation is selected with the testify_yaml_custom build tag.
+//
+//	go test -tags testify_yaml_custom
+//
+// This implementation can be used at build time to replace the default implementation
+// to avoid linking with [gopkg.in/yaml.v3].
+//
+// In your test package:
+//
+//		import assertYaml "github.com/stretchr/testify/assert/yaml"
+//
+//		func init() {
+//			assertYaml.Unmarshal = func (in []byte, out interface{}) error {
+//				// ...
+//	     			return nil
+//			}
+//		}
+package yaml
+
+var Unmarshal func(in []byte, out interface{}) error