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.

2 files changed, 0 insertions, 10 deletions

diff --git a/vendor/stacker/src/arch/asm.h b/vendor/stacker/src/arch/asm.h
deleted file mode 100644
index 56c9d289..00000000
--- a/vendor/stacker/src/arch/asm.h
+++ /dev/null
@@ -1,5 +0,0 @@
-#if defined(APPLE) || (defined(WINDOWS) && defined(X86))
-#define GLOBAL(name) .globl _ ## name; _ ## name
-#else
-#define GLOBAL(name) .globl name; name
-#endif
diff --git a/vendor/stacker/src/arch/windows.c b/vendor/stacker/src/arch/windows.c
deleted file mode 100644
index 89485a0c..00000000
--- a/vendor/stacker/src/arch/windows.c
+++ /dev/null
@@ -1,5 +0,0 @@
-#include <windows.h>

-

-PVOID __stacker_get_current_fiber() {

-    return GetCurrentFiber();

-}