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, 15 deletions

diff --git a/vendor/rustix/src/mm/mod.rs b/vendor/rustix/src/mm/mod.rs
deleted file mode 100644
index 7505cac0..00000000
--- a/vendor/rustix/src/mm/mod.rs
+++ /dev/null
@@ -1,15 +0,0 @@
-//! Memory map operations.
-
-#[cfg(not(target_os = "redox"))]
-mod madvise;
-mod mmap;
-mod msync;
-#[cfg(linux_kernel)]
-mod userfaultfd;
-
-#[cfg(not(target_os = "redox"))]
-pub use madvise::{madvise, Advice};
-pub use mmap::*;
-pub use msync::{msync, MsyncFlags};
-#[cfg(linux_kernel)]
-pub use userfaultfd::{userfaultfd, UserfaultfdFlags};