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, 43 deletions

diff --git a/vendor/rustix/src/process/pidfd.rs b/vendor/rustix/src/process/pidfd.rs
deleted file mode 100644
index f812a9f6..00000000
--- a/vendor/rustix/src/process/pidfd.rs
+++ /dev/null
@@ -1,43 +0,0 @@
-use crate::fd::OwnedFd;
-use crate::process::{Pid, Signal};
-use crate::{backend, ffi, io};
-use backend::fd::AsFd;
-
-bitflags::bitflags! {
-    /// `PIDFD_*` flags for use with [`pidfd_open`].
-    ///
-    /// [`pidfd_open`]: crate::process::pidfd_open
-    #[repr(transparent)]
-    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
-    pub struct PidfdFlags: ffi::c_uint {
-        /// `PIDFD_NONBLOCK`
-        const NONBLOCK = backend::c::PIDFD_NONBLOCK;
-
-        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
-        const _ = !0;
-    }
-}
-
-/// `syscall(SYS_pidfd_open, pid, flags)`—Creates a file descriptor for a
-/// process.
-///
-/// # References
-///  - [Linux]
-///
-/// [Linux]: https://man7.org/linux/man-pages/man2/pidfd_open.2.html
-#[inline]
-pub fn pidfd_open(pid: Pid, flags: PidfdFlags) -> io::Result<OwnedFd> {
-    backend::process::syscalls::pidfd_open(pid, flags)
-}
-
-/// `syscall(SYS_pidfd_send_signal, pidfd, sig, NULL, 0)`—Send a signal to a
-/// process specified by a file descriptor.
-///
-/// # References
-///  - [Linux]
-///
-/// [Linux]: https://man7.org/linux/man-pages/man2/pidfd_send_signal.2.html
-#[inline]
-pub fn pidfd_send_signal<Fd: AsFd>(pidfd: Fd, sig: Signal) -> io::Result<()> {
-    backend::process::syscalls::pidfd_send_signal(pidfd.as_fd(), sig)
-}