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, 27 deletions

diff --git a/vendor/rustix/src/ioctl/bsd.rs b/vendor/rustix/src/ioctl/bsd.rs
deleted file mode 100644
index 965b31d1..00000000
--- a/vendor/rustix/src/ioctl/bsd.rs
+++ /dev/null
@@ -1,27 +0,0 @@
-//! `ioctl` opcode behavior for BSD platforms.
-
-use super::{Direction, Opcode};
-
-pub(super) const fn compose_opcode(
-    dir: Direction,
-    group: Opcode,
-    num: Opcode,
-    size: Opcode,
-) -> Opcode {
-    let dir = match dir {
-        Direction::None => NONE,
-        Direction::Read => READ,
-        Direction::Write => WRITE,
-        Direction::ReadWrite => READ | WRITE,
-    };
-
-    dir | num | (group << 8) | ((size & IOCPARAM_MASK) << 16)
-}
-
-// `IOC_VOID`
-pub const NONE: Opcode = 0x2000_0000;
-// `IOC_OUT` (“out” is from the perspective of the kernel)
-pub const READ: Opcode = 0x4000_0000;
-// `IOC_IN` (“in” is from the perspective of the kernel)
-pub const WRITE: Opcode = 0x8000_0000;
-pub const IOCPARAM_MASK: Opcode = 0x1FFF;