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, 18 deletions

diff --git a/vendor/rustix/src/process/pivot_root.rs b/vendor/rustix/src/process/pivot_root.rs
deleted file mode 100644
index 91672774..00000000
--- a/vendor/rustix/src/process/pivot_root.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-#[cfg(feature = "fs")]
-#[cfg_attr(docsrs, doc(cfg(feature = "fs")))]
-use crate::{backend, io, path};
-
-/// `pivot_root(new_root, put_old)`—Change the root mount.
-///
-/// # References
-///  - [Linux]
-///
-/// [Linux]: https://man7.org/linux/man-pages/man2/pivot_root.2.html
-#[cfg(feature = "fs")]
-#[cfg_attr(docsrs, doc(cfg(feature = "fs")))]
-#[inline]
-pub fn pivot_root<P: path::Arg, Q: path::Arg>(new_root: P, put_old: Q) -> io::Result<()> {
-    new_root.into_with_c_str(|new_root| {
-        put_old.into_with_c_str(|put_old| backend::process::syscalls::pivot_root(new_root, put_old))
-    })
-}